livemcq১টি পরীক্ষায় এসেছেপ্রশ্ন ৫৪A sum of money placed at compound interest doubles itself in 4 years. In how many years will it amount to 8 times itself?কক) 12 Yearsখখ) 8 yearsগগ) 16 yearsঘঘ) 64 yearsউত্তর দেখুন