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### Question

A certain amount is split into two parts. The first part is invested at 10% p.a. and the second at 5% p.a. What is the total amount if the total simple interest at the end of 2 years is Rs. 240, and if the amount invested at 10% is Rs. 1400?

**A**

Rs. 1000.

**B**

Rs. 1100.

**C**

Rs. 900.

**D**

Rs. 1200.

**Soln.**

**Ans: a**

Let the amount x be invested at r1% and remaining (P - x) at r2%, and let the sum of interests be I. Then, I = ${x × r_1 × 2}/100$ + ${(P - x) × r_2 × 2}/100$, which simplifies to 100I = 2 × ($x × (r_1 - r_2) + P × r_2$). Putting r_{1} = 10, r_{2} = 5, x = 1400, I = 240, we get P = Rs. 1000.