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ব্যাংক নিয়োগ প্রস্তুতি ⎯ লং কোর্স

পরীক্ষাব্যাংক নিয়োগ প্রস্তুতি ⎯ লং কোর্সতারিখতারিখ অনির্ধারিতসময়30 minutes
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Math - 09: Simple & Compound Interest, Stocks & Shares
ঘনত্ব
উত্তর
উত্তরিতবর্তমানপুনরায় দেখুনঅসম্পূর্ণ

ব্যাংক নিয়োগ প্রস্তুতি ⎯ লং কোর্স

ব্যাংক নিয়োগ প্রস্তুতি ⎯ লং কোর্স · তারিখ অনির্ধারিত · ২৩ প্রশ্ন

.
At the rate of 8.5% p. a. simple interest, sum of Tk. 4800 will earn how much interest in 2 years 6 months? 
  1. ক) Tk.918
  2. খ) Tk.1020
  3. গ) Tk.980
  4. ঘ) Tk.1080
সঠিক উত্তর:
খ) Tk.1020
উত্তর
সঠিক উত্তর:
খ) Tk.1020
ব্যাখ্যা
Principal = Tk. 4800
Rate = 8.5%
Time = 2 years + 6 months
         = 2 + (6/12)
         = 2 + (1/2)
         = 5/2
         = 2.5 years


Simple Interest = (4800 × 8.5 × 2.5)/100
                         = Tk.1020
.
The compound interest on a certain sum for 2 years at 10% per annum is Tk. 525 . The simple interest on the same sum for doubled the time at half the rate percent per annum is-
  1. ক) Tk. 450
  2. খ) Tk. 480
  3. গ) Tk. 500
  4. ঘ) Tk. 550
সঠিক উত্তর:
গ) Tk. 500
উত্তর
সঠিক উত্তর:
গ) Tk. 500
ব্যাখ্যা
Let the sum be Tk. P

Here 
  P(1 + 10/100)2 - P = 525
or, P(110/100)2 - P = 525 
or, P(1.1)2 - P = 525
or, P( 1.21 - 1) = 525
or, P × 0.21 = 525 
or, p = 525/.21
   P = 2500

Again
S.I = (2500 × 5 × 4)/100
    = 500
.
A sum of money at a simple interest doubles in 5 years. It will become four times in:
  1. ক) 10 years
  2. খ) 12 years
  3. গ) 15 years
  4. ঘ) 20 years
সঠিক উত্তর:
গ) 15 years
উত্তর
সঠিক উত্তর:
গ) 15 years
ব্যাখ্যা
Case I:
Let principal be x
So, Amount after 5 years = 2x
Simple interest = Amount - Principal
                         = 2x - x
                         = x
Interest = Principal
So x = (x × R × 5)/100
⇒ R = 100/5 

Case II:
Amount = 4x
Interest = 4x - x = 3x
Interest = 3 × Principal
Now
3x = [x × (100/5) × T2]/100
T2/5 = 3
⇒ T2 = 15 years
.
The principal that amounts to Tk. 4913 in 3 years at (25/4)% per annum compound interest compounded annually, is-
  1. ক) Tk. 4386
  2. খ) Tk. 4266
  3. গ) Tk. 4096
  4. ঘ) Tk. 4566
সঠিক উত্তর:
গ) Tk. 4096
উত্তর
সঠিক উত্তর:
গ) Tk. 4096
ব্যাখ্যা

Here 
C. P = Tk. 4913
Time = 3 years 
Rate = (25/4)% = 25/(4 × 100) = 1/16

Principal (P) = ?
C.P = P(1 + r)n
4913 =P(1 + 1/16)3
4913 =P(17/16)3
P = 4913/(17/16)3
P = 4913 × (16/17) × (16/17) × (16/17) 
P = Tk. 4096
.
At what rate percent of simple interest will a sum of money double itself in 15 years ? 
  1. ক) (13/3)%
  2. খ) (15/3)%
  3. গ) (10/3)%
  4. ঘ) (20/3)%
সঠিক উত্তর:
ঘ) (20/3)%
উত্তর
সঠিক উত্তর:
ঘ) (20/3)%
ব্যাখ্যা
Let the principal be x.
Then, the amount after 15 years be 2x.
Let the rate of interest be R.
S.I. = 2x - x = x

Then,
S.I. = P × R × T/100
⇒ x = x × R × 15/100
⇒ R = 100/15
      = 20/3 
∴ The rate of interest is 20/3%.
.
The simple interest on a certain sum of money at the rate of 5 p.a. for 8 years is Tk. 840. The rate of interest for which the same amount of interest can be received on the same sum after 5 years is:
  1. ক) 6%
  2. খ) 8%
  3. গ) 9%
  4. ঘ) 10%
সঠিক উত্তর:
খ) 8%
উত্তর
সঠিক উত্তর:
খ) 8%
ব্যাখ্যা
S.I =Tk. 840
R = 5%
T = 8 years
Principal = (100 × 840)/(5 × 8)
              = Tk. 2100

Again 
S.I =Tk. 840
Principal = Tk. 2100
T = 5 years
Rate = (100 × 840)/(2100 × 5)
        = 8%
.
How many shares of market value Tk. 25 each can be purchased for Tk.15300, brokerage being 2% ? 
  1. ক) 450
  2. খ) 400
  3. গ) 550
  4. ঘ) 600
সঠিক উত্তর:
ঘ) 600
উত্তর
সঠিক উত্তর:
ঘ) 600
ব্যাখ্যা
CP of each share = Tk. (25 + 2% of 25) = Tk. 25.50. 

Number of shares= 15300/25.50
                             = 600
.
Simple interest on a certain sum at a certain annual rate of interest is 1/9 of the sum. If the numbers representing rate percent and time in years be equal, then the rate of interest is -
  1. ক) (8/3)%
  2. খ) (7/3)%
  3. গ) (5/3)%
  4. ঘ) (10/3)%
সঠিক উত্তর:
ঘ) (10/3)%
উত্তর
সঠিক উত্তর:
ঘ) (10/3)%
ব্যাখ্যা
Let sum=x Then, S.I.=x/9.
Let rate=R% and time= R years.
Now
(x × R × R)/100 = x/9
R2/100 = 1/9
R2 = 100/9
R = 10/3

Rate=(10/3)%
.
A man invested Tk. 5280 in Tk.10 shares quoted at Tk. 8.25. If the rate of dividend be 12%, his annual income is: 
  1. ক) Tk.788
  2. খ) Tk.678
  3. গ) Tk.768
  4. ঘ) Tk.748
সঠিক উত্তর:
গ) Tk.768
উত্তর
সঠিক উত্তর:
গ) Tk.768
ব্যাখ্যা
Number of shares =(5280/8.25​) = 640
Face value = Tk.(640 × 10)= Tk.6400
Annual income = {(12/100) ​× 6400} = 768
১০.
A certain sum of money is invested at an interest rate of 5% per annum and a second sum twice as large as the first is invested at 5.5% p. a. The total amount of interest earned from two investments together is Tk. 1000 per year and the interest is withdrawn every year. The second sum invested is: 
  1. ক) Tk.18750
  2. খ) Tk.6250
  3. গ) Tk.12500
  4. ঘ) Tk.6500
সঠিক উত্তর:
গ) Tk.12500
উত্তর
সঠিক উত্তর:
গ) Tk.12500
ব্যাখ্যা
Let 
Two sums Tk. x and Tk. 2x

Now
{(x × 5 × 1)/100} + {(2x × 5.5× 1)/100} = 1000
5x + 11x = 100000
16x = 100000
x = 6250

Second sum =Tk. (6250 × 2) =  Tk. 12500
১১.
A man invested Tk.1552 in a stock at 97 to obtain an income of Tk. 128. The dividend from of the stock is-
  1. ক) 5%
  2. খ) 6%
  3. গ) 7%
  4. ঘ) 8%
সঠিক উত্তর:
ঘ) 8%
উত্তর
সঠিক উত্তর:
ঘ) 8%
ব্যাখ্যা
By investing Tk. 1552, income Tk. 128
By investing Tk. 97, income = (128 ​×97)/1552
                                             = 8
১২.
A sum of money at simple interest amounts to Tk. 815 in 3 years and to Tk. 854 in 4 years. The sum is -
  1. ক) Tk.638
  2. খ) Tk.469
  3. গ) Tk.718
  4. ঘ) Tk. 698
সঠিক উত্তর:
ঘ) Tk. 698
উত্তর
সঠিক উত্তর:
ঘ) Tk. 698
ব্যাখ্যা
S. I for 1 year = Tk. (854 - 815)
                       = Tk. 39 
S. I for 3 years = Tk. (39 × 3) 
                        =  Tk. 117 

Principal = Tk. (815 - 117) = Tk. 698
১৩.
By investing Tk. 3450 in a 4.5% stock , a man obtains an income of Tk. 150. Find the market price of the stock. 
  1. ক) Tk. 98.5
  2. খ) Tk. 100.5
  3. গ) Tk. 101.5
  4. ঘ) Tk. 103.5
সঠিক উত্তর:
ঘ) Tk. 103.5
উত্তর
সঠিক উত্তর:
ঘ) Tk. 103.5
ব্যাখ্যা
To earn Tk. 150 investment = Tk. 3450
To earn Tk. 4.5 investment = Tk. (3450 × 4.5)/150
                                            = Tk. 103.5  
১৪.
A sum of money lent out at simple interest amounts Tk. 720 after 2 years and to Tk.1020 after a further period of 5 years. What is the sum ?
  1. ক) Tk. 450
  2. খ) Tk. 400
  3. গ) Tk. 480
  4. ঘ) Tk. 600
সঠিক উত্তর:
ঘ) Tk. 600
উত্তর
সঠিক উত্তর:
ঘ) Tk. 600
ব্যাখ্যা
⇒  S.I. for 2 years = Tk. 720.
⇒  S.I. for 7 years = Tk. 1020
∴   S.I. for 5 years = Tk. 1020 - Tk. 720= Tk. 300.

S.I. for 2 years =(300​/5) × 2= Tk..120
Principal=720 - 120 = Tk. 600
∴  The sum is Tk. 600.
১৫.
The compound interest on Tk. 2500 for 2 years at 10% p. a is- 
  1. ক) Tk. 395.5
  2. খ) Tk. 375.5
  3. গ) Tk. 378.5
  4. ঘ) Tk. 525.0
সঠিক উত্তর:
ঘ) Tk. 525.0
উত্তর
সঠিক উত্তর:
ঘ) Tk. 525.0
ব্যাখ্যা
Given,
Principal, P = Tk. 2500
Compound rate , R = 10%
Time n = 2 years

 
Compound Principal = [2500(1 + 10/100)2]
                                  = [2500(1.1)2]
                                   =3025

∴C.I. = Tk.(3025 - 2500)=Tk. 525
১৬.
The interest on a certain deposit at 4.5% p.a. is TK. 202.50 in one year. How much will the additional interest in one year be on the same deposit at 5% p.a. ?
  1. ক) Tk. 20.50
  2. খ) Tk. 24.50
  3. গ) Tk. 25.50
  4. ঘ) Tk. 22.50
সঠিক উত্তর:
ঘ) Tk. 22.50
উত্তর
সঠিক উত্তর:
ঘ) Tk. 22.50
ব্যাখ্যা
S.I = TK. 202.50 
r = 4.5% 
n = 1

Now
I = pnr/100
P = I × 100/nr = ( 202.50 × 100)/( 1× 4.5) = 4500 Tk.

Again 
I = pnr
  = 4500 × 1 × 5/100 = 225

The total additional interest = ( 225 - 202.50) Tk. = Tk. 22.50
১৭.
The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 4% per annum is Tk. 1. The sum (in Tk.) is:
  1. ক) Tk.645
  2. খ) Tk. 635
  3. গ) Tk. 625
  4. ঘ) Tk. 655
সঠিক উত্তর:
গ) Tk. 625
উত্তর
সঠিক উত্তর:
গ) Tk. 625
ব্যাখ্যা
Let the sum be Tk. x.
Then
C. I = x(1 + 4/100)2 - x
      = x(104/100)2 - x
      = x(26/25)2 - x
      = 676x/625 - x
      = (676x - 625x)/625
      = 51x/625

S.I =(x × 4 × 2)/100 = 2x/25

Now
(51x/625) - (2x/25) = 1
(51x - 50x)/625 = 1
x /625 = 1
x = 625
১৮.
A man invested Tk. 14400 in Tk. 100 shares of a company at 20% premium. If the company declares 5% dividend at the end of the year, then how much does he get? 
  1. ক) Tk. 600  
  2. খ) Tk. 450  
  3. গ) Tk. 630  
  4. ঘ) Tk. 500  
সঠিক উত্তর:
ক) Tk. 600  
উত্তর
সঠিক উত্তর:
ক) Tk. 600  
ব্যাখ্যা
Number of shares = 14400/120 = 120 
Face value = Tk. (120 × 100) = Tk. 12000 
 
Annual income = (5/100) × 12000 = Tk . 600  
১৯.
What will be the ratio of simple interest earned by certain amount at the same rate of interest for 6 years and that for 9 years? 
  1. ক) 2 : 5
  2. খ) 5 : 3
  3. গ) 2 : 3
  4. ঘ) 2 : 1
সঠিক উত্তর:
গ) 2 : 3
উত্তর
সঠিক উত্তর:
গ) 2 : 3
ব্যাখ্যা
Let 
The principal be P and  rate of interest be r% 

Required ratio = [(P × r × 6)/100]/[(P × r × 9)/100]
                          =6Pr/9Pr
                          = 6/9
                            = 2/3
                          = 2 : 3
  
২০.
Hannan invested an amount of Tk. 5000 in a fixed deposit scheme for 2 years at compound interest rate 5 p.c.p.a. How much amount will Hannan get on maturity of the fixed deposit?
  1. ক) Tk 5152.5
  2. খ) Tk. 5512.5
  3. গ) Tk. 5522.5
  4. ঘ) Tk. 5535.5
সঠিক উত্তর:
খ) Tk. 5512.5
উত্তর
সঠিক উত্তর:
খ) Tk. 5512.5
ব্যাখ্যা
Amount
= 5000 (1 + 5/100)2
= 5000 ×(1.05)2
= 5000 × 1.1025
= 5512.5
২১.
How long (years) will it take a sum of money invested at 5% p.a. S. I. to increase its value by 40%? 
  1. ক) 6 years 
  2. খ) 8 years 
  3. গ) 7 years 
  4. ঘ) 5 years 
সঠিক উত্তর:
খ) 8 years 
উত্তর
সঠিক উত্তর:
খ) 8 years 
ব্যাখ্যা
Let sum of money be Tk. x
S.I = 40% of x = 2x​/5

Given rate =5%

Time =[100×(2x​​/5)×(1​​/5x)​]
   = 8 years
২২.
The compound interest on Tk. 30000 at 7% per annum is Tk. 4347. The period (in years) is: 
  1. ক) 2
  2. খ) 3
  3. গ) 4
  4. ঘ) 5
সঠিক উত্তর:
ক) 2
উত্তর
সঠিক উত্তর:
ক) 2
ব্যাখ্যা
C. P = TK. (30000 + 4347) = TK. 34347.
Let the time be n years

Then,
30000(1 + 7/100)n = 34347
(107/100)n = 34347/30000
(107/100)n = 11449/10000
(107/100)n = (107/100)2
n = 2
২৩.
Two equal sum of money were lent at simple interest at 11% p. a for the 7/2 years and 9/2 years respectively. If the difference in interests for two periods was Tk. 411.4, Then each sum is: 
  1. ক) Tk. 3740
  2. খ) Tk. 3760
  3. গ) Tk. 3750
  4. ঘ) Tk. 3780
সঠিক উত্তর:
ক) Tk. 3740
উত্তর
সঠিক উত্তর:
ক) Tk. 3740
ব্যাখ্যা
Let the each sum be x 
Now 
{(x × 11 × 9)/(100 × 2)} - {(x × 11 × 7)/(100 × 2)} = 411.4
(99x - 77x)/200 = 411.4
22x = 82,280
x= 82,280/22
x = 3740