A sum of money doubles itself at compound interest in 10 years. In how many years will it be four times at the same rate of Interest?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 20.
Trick:
2 ---> 10 years
22 ---> x
Now multiply the power of 2 with 10
2 × 10 = 20 years
So, the money will be four times in 20 years