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### Question

The difference between simple interests on an amount @11% for 18 years and at 6% for 16 years is Rs. 816. What is the amount?

**A**

Rs. 800.

**B**

Rs. 900.

**C**

Rs. 700.

**D**

Rs. 1000.

**Soln.**

**Ans: a**

The shortcut formula is P = ${\text"diff" × 100}/{r_1 × t_1 - r_2 × t_2}$. Putting r_{1} = 11, t_{1} = 18, r_{2} = 6, t_{2} = 16, diff = 816, we get P = Rs. 800.