# At What Rate Per Annum

At what rate per annum will the simple interest on a certain sum of money be 1/5 of the amount in 10 year?

- 5%
- 2%
- 1%
- 8%

**Answer: (2) 2 %**

**Explanation:-**

Let be the principal = Rs.X & Rate is R%.

According to the question,

X/5 = X x 10 x R/100

R = 100/100 x 5

R = 2 %

Hence, the answer is (2) 2 %.