1. Due to the annual simple interest rate decreasing from 4% to 3\(\frac{3}{4}\)%, a person's annual income decreases by ₹60. What is that person's principal amount?

2. Due to the decrease in the annual simple interest rate from 4% to 3\(\frac{3}{4}\)%, a person's annual income decreases by 60 rupees. What is the principal amount of that person?

3. Due to a decrease in the annual simple interest rate from \(4\%\) to \(3\frac{3}{4}\%\), a person's annual income is reduced by ₹600. Find that person's principal (capital).

4. Due to a decrease in the annual simple interest rate from 4% to 3\(\cfrac{3}{4}\)%, Mr. Amal's annual income is reduced by ₹60. Find Mr. Amal's principal.

5. If the annual simple interest rate increases from 4% to 5%, causing a person's income to rise by ₹1000, then the person's principal amount is _____.

(a) ₹ 4000 (b) ₹ 5000 (c) ₹ 10000 (d) ₹ 50000

6. If the annual simple interest rate increases from 4% to 5%, causing a person's income to rise by ₹1000, then the person's principal amount is _____.

(a) ₹ 4000 (b) ₹ 5000 (c) ₹ 10000 (d) ₹ 50000

7. The annual simple interest rate decreases from \( 4\% \) to \( 3\frac{3}{4}\% \), causing a person's yearly income to reduce by 60 rupees. Find the principal amount of that person.

8. Due to the annual simple interest rate decreasing from \(4\%\) to \(3\frac{3}{4}\%\), a person's annual income decreases by ₹60. Find that person's principal amount.

9. A person's annual income decreases by ₹60 when the rate of interest drops from 4% to \(3\frac{3}{4}\)% (i.e., 3.75%). Find the principal amount.

10. A farmer deposited some money in the village post office. After 4 years, he found that the total amount including interest had become ₹434. He calculated that the interest he received was \(\frac{6}{25}\) of his principal amount. Find how much money he had originally deposited and what annual rate of simple interest the post office gave.

11. Raju lent ₹400 to Ajay for 2 years and ₹100 to Manoj for 4 years. He received a total of ₹60 as simple interest from both. What is the annual rate of simple interest?

12. Due to the annual simple interest rate decreasing from 4% to 3 \(\frac{3}{4}\)% (i.e. 3.75%), Mr. Amal's annual income decreases by ₹60. Calculate Mr. Amal's principal (capital).

13. A certain sum of money amounts to ₹944 in 3 years at simple interest. If the rate of interest is increased by 25%, the same sum amounts to ₹980 in the same time period. Find the principal amount and the original rate of interest.

14. When Mr. Subir retired from his job, he received a lump sum of ₹6,00,000 from his Provident Fund and Gratuity. He wants to divide this amount between the post office and the bank in such a way that he earns ₹34,000 annually as interest. If the annual simple interest rates of the post office and the bank are 6% and 5% respectively, determine how much money he should deposit in each.

15. Mr. Amal bequeaths ₹56,000 in his will for his two sons aged 13 and 15 in such a way that, when they each turn 18, the simple interest earned at an annual rate of 10% will be equal to the principal for each. What will be the allocated amount for each son in the will?

16. Due to the annual simple interest rate decreasing from 6% to 5\(\frac{1}{2}\)%, a person's annual income decreased by 75 rupees. How much money had they deposited in the bank?

17. Due to the annual simple interest rate decreasing from 4% to 3\(\frac{3}{4}\)%, Amal Babu's annual income reduces by ₹60. Determine Amal Babu's principal amount.

18. If the difference between the compound interest and simple interest on a certain sum for 3 years at an annual rate of 10% is 930 rupees, then what is the principal amount?

19. If ₹800 is deposited in a bank at an annual simple interest rate of 10%, and the total amount received (principal + interest) is ₹1200, then calculate and write for how long the money was deposited in the bank.

20. My aunt wants to will ₹56,000 between her two sons, aged 13 and 15, in such a way that by the time each turns 18, the total amount (principal + interest) received by both sons is equal. The interest is calculated at an annual simple interest rate of 10%. Determine how much should be allotted to each son in the will.

21. If the total simple interest for \(n\) years at an annual rate of \(x\%\) is \(\frac{pnr}{25}\), > then what is the principal amount?

(a) 2p rupees (b) 4p rupees (c) \(\cfrac{p}{2}\) rupees (d) \(\cfrac{p}{4}\) rupees

22. A borrowed ₹860 from B at an annual simple interest rate of 6%, with the agreement to repay the loan over the next four yearly installments. In each of the first three installments, A would pay only one-fourth of the principal. In the final (fourth year’s) installment, A would pay the remaining principal and the total accumulated interest. What amount will A pay at the end of the fourth year?