1. How much money will become ₹360 in 5 years at an annual simple interest rate of 4%?

(a) ₹ 300 (b) ₹ 320 (c) ₹ 280 (d) ₹ 340

2. A bank provides an annual simple interest rate of 5%. At the beginning of the year, Mr. Dip deposited 15,000 rupees. Three months later, he withdrew 3,000 rupees, and three months after withdrawing the amount, he deposited 4,000 rupees again. At the end of the year, how much money will Mr. Dip receive from the bank, including interest?

3. At an annual interest rate of 4%, for how much money will the difference between the simple interest and the compound interest for 2 years be 80 rupees? Let’s calculate and write it down.

4. 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.

5. At an annual interest rate of 4%, how much money should be invested so that the total amount becomes ₹3600 in 5 years?

6. My uncle borrowed ₹40,000 for 3 years in such a way that the annual compound interest rates for the first, second, and third years were 2%, 3%, and 4% respectively. How much money will he repay (principal + interest) at the end of 3 years?

7. Jayantababu deposits 1500 rupees on the first day of each month in a monthly savings scheme. If the annual simple interest rate at the bank is 4%, then how much will he receive at the end of the year, including interest?

8. At an annual simple interest rate of 5%, a person deposits some money in the bank. After 5 years, how much total amount will he receive, if the principal is 12,500 rupees less than the total amount (principal + interest?

9. At an annual simple interest rate of 8%, in how many years will 5000 rupees grow to 7400 rupees?

(a) 3 years (b) 4 years (c) 5 years (d) 6 years

10. At an annual simple interest rate of \(6\cfrac{1}{4}\%\), how much principal amount will yield a daily interest of 1 rupee?

(a) ₹ 5840 (b) ₹ 6400 (c) ₹ 5000 (d) ₹ 6000

11. ₹1200 is lent at an annual interest rate of 6\(\frac{1}{4}\)% and ₹1000 is lent at an annual interest rate of 4\(\frac{1}{3}\)% on the same day. After how much time will the amounts (principal + interest) of both loans become equal?

(a) 20 years (b) 24 years (c) 15 years (d) 30 years

12. If a sum of money becomes 4 times its original amount in *n* years at a fixed annual compound interest rate, then in how many years will it become 4 times?

13. If a certain amount of money doubles in 4 years at a fixed annual compound interest rate, in how many years will it become four times?

14. If a sum of money doubles in \(n\) years at a fixed annual compound interest rate, then in how many years will it become 4 times?

15. Rekha received ₹100,000 upon retirement. She deposited part of the amount in a bank and the rest in a post office, earning ₹5,400 as annual interest. The annual simple interest rates at the bank and post office are 5% and 6% respectively. How much money did she deposit in each place?

16. Ramen Babu deposits a total of ₹3,70,000 in three banks. The annual simple interest rates of the three banks are 4%, 5%, and 6% respectively. After one year, the total interest earned from each bank is the same. How much money did he deposit in each bank?

17. Prakash Babu invested ₹48,000 for 2 years at an annual compound interest rate of 10%. If 20% income tax is deducted from the interest earned each year, how much money will he receive at the end of the second year?

18. Bimalkaku deposited ₹187,500 in a bank at an annual 5% simple interest for his 12-year-old son and 14-year-old daughter, in such a way that when both of them turn 18, they will each receive the same amount of money (principal + interest). How much money did he deposit for his son and daughter respectively?

19. At an annual simple interest rate of \(6\frac{1}{4}\%\), in how many years will a sum of money double?

20. 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.

21. At an annual interest rate of 20%, for how much principal will the difference between compound interest and simple interest for 3 years be ₹1024?

(a) ₹ 2800 (b) ₹ 1100 (c) ₹ 8000 (d) ₹ 3000

22. Ishan deposits 1000 rupees on the first day of each month in a monthly savings scheme. If the annual simple interest rate is 5%, how much will Ishan receive, including interest, at the end of 9 months?

23. If a certain amount of money doubles in \(n\) years under a fixed annual compound interest rate, in how many years will it become 4 times its original value?

24. Two friends borrowed ₹15,000 from a bank at an annual simple interest rate of 12% to run a small business together. Calculate how much interest they will have to pay after 4 years.

25. At an annual simple interest rate of 5.25%, Shova Devi deposited a certain amount of money in a bank. After 2 years, she received ₹840 as interest. Calculate how much money she had deposited.

26. When Aslam Chacha retired from work, he received ₹1,00,000. He deposited part of the money in a bank and the rest in the post office. Every year, he receives ₹5400 as interest in total. If the annual simple interest rates of the bank and post office are 5% and 6% respectively, calculate and write how much money he deposited in each.

27. Mr. Rathin deposits money in the bank for each of his two daughters in such a way that when each daughter turns 18 years old, she will receive ₹120000. The bank offers simple interest at an annual rate of 10%. The current ages of the daughters are 13 years and 8 years respectively. Calculate how much Mr. Rathin deposited in the bank for each daughter.

28. Bimal Kaku deposited ₹187,500 in a bank at an annual simple interest rate of 5% for his 12-year-old son and 14-year-old daughter, in such a way that when both children turn 18, they each receive the same amount (principal plus interest). Let us calculate how much money he deposited for his son and daughter individually.

29. Ramen Babu deposited a total of ₹370,000 across three banks. The annual simple interest rates for these three banks are 40%, 5%, and 6%, respectively. After one year, the amount of interest he earns from each bank is the same. Let us calculate how much money he deposited in each of the three banks.

30. If the total amount becomes 966 rupees at an annual simple interest rate of 3% in 5 years, the principal amount will be -

(a) 480 rupees (b) 408 rupees (c) 404 rupees (d) 840 rupees