**1. If the difference between simple interest and compound interest on a certain sum of money for 3 years at 10% per annum is Rs 31, The sum is.**

a) 500

b) 750

c) 1000

d) 1250

**Answer: 1000**

**2. The difference betwen compound interest and simple interest on a certain sum for 3 years at 5% per annum is Rs 122. The sum is:**

a) Rs 16,000

b) Rs 15,000

c) Rs 12,000

d) Rs 10,000

Answer: Rs 16,000

Answer: Rs 16,000

**3. The difference between simple and compound interest on a sum of money at 20% per annum for 3 years is Rs. 48. What is the sum?**

a) Rs. 550

b) Rs. 500

c) Rs. 375

d) Rs. 400

**Answer: Rs. 375**