1. What will be the simple interest earned on an amount of ₹988 at the rate of 18% per annum at the end of 5 years?

2. A person borrowed ₹8500 at a simple interest rate of 9% per annum. How much total amount will he have to return at the end of 2.5 years (2½ years)?

3. Divide an amount of ₹3600 into two parts such that the simple interest on the first part at 5% per annum for 3 years is equal to the simple interest on the second part at 6.25% (6¼%) per annum for 4 years. These amounts are respectively:

4. Two equal amounts are lent to X and Y at 7.5% per annum for 4 years and 5 years respectively. If the difference between the interests paid by them is ₹150, what is each amount lent?

5. Arun invested a certain sum of money at a certain rate of simple interest for 4 years. If he had invested the same sum for 6 years, the interest earned by him would have been 50% more than the earlier interest earned. What is the annual rate of interest?

6. A sum of money was invested at a certain rate of simple interest for 2 years. Had it been invested at a 3% higher rate, it would have fetched ₹72 more. What is the sum?

7. A money-lender finds that due to a fall in the annual rate of interest from 8% to 7.75% (7¾%), his yearly income diminishes by ₹61.50. What is his capital?

8. The simple interest accrued on an amount at the rate of 8% per annum as the end of 6 years is ₹1200. What would be the simple interest earned on thrice this principal amount at the rate of 10% per annum at the end of 2 years?

9. One-third (1/3) of a certain sum is invested at 3% per annum, 1/6th part at 6% per annum, and the remaining sum at 8% per annum. If the total simple interest received in one year is ₹600, what is the sum?

10. Samita took a loan at a simple interest rate of 6% per annum. This rate increases every year by 1.5% per annum. At the end of three years, she pays ₹8190 as interest. What is the loan amount?