# In how many years,

In how many years, a sum will be thrice of it at the rate of 10% per annum?

- 15 years
- 20 years
- 30 years
- 25 years

**Answer: (2) 20 years**

**Explanation:-**

**Given-**

R = 10 % , S I = 3 P – P = 2 P & T = ?

**Formula-**

**Simple Interest = P x R x T/100**

**where, P – principal, R – rate, T – time S I = Simple Interest**

Then,

2 P = P x 10 x T/100

2 = T/10

T = 2 x 10

T = 20 years

Hence, In 20 years, a sum will be thrice of it at the rate of 10% per annum.