Question

The least number of complete years in which as sum of money put out at 20% compound interest will be more than doubled is?

• A. 3
• B. 4
• C. 5
• D. 6

Answer 1

The correct option is B 4

$P={(1+\frac{20}{100})}^n>2Por{\left(\frac{6}{5}\right)}^n>2Now(\frac{6}{5}\times \frac{6}{5}\times \frac{6}{5}\times \frac{6}{5})>2So,n=4years.$