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### Question

Mr. X puts an amount of Rs. 3900 in a simple interest scheme. If he gets a total amount of Rs. 5304 after 4 months, what is the rate of interest?

**A**

${3/4}$% p.a.

**B**

9% p.a.

**C**

${11/12}$% p.a.

**D**

1% p.a.

**Soln.**

**Ans: a**

The interest is I = 5304 - 3900 = 1404. So R = $(I × 100)/(T × P)$. Solving, we get R = $(1404 × 100)/(4 × 3900)$ = 9% per month, which is ${3/4}$% per annum. *Please note that since the time is in months the rate is also p.m.*