Question

boun
17. At compound interest a certain sum becomes twice in 5 years. In how many years will it become 16
times
1) 15
2) 20
3) 25
4) 30
5) None of these​

Answer 1

Answer:

2) 20

Step-by-step explanation:

If the sum doubles (x2) in 5 years, then it to become 2*2*2*2 = 16 times as large it should double four times, so four 5 years time period are needed, which is 4*5 = 20 years.