# Arithmetic Aptitude :: Simple Interest

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## 9. Simple interest on a certain sum is 16/25 of the sum. Find the rate percent and time, if both are numerically equal.

**Answer:**

**Option A**

**Explanation :**

Let sum = X. Then S.I. = 16x/25

Let rate = R% and Time = R years.

Therefore, x * R * R/100 = 16x/25 or R^2 = 1600/25, R = 40/5 = 8

So, Rate = 8% and Time = 8 years.

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