1. What annual payment will discharge a debt of Rs. 1620 dues in 5 years at 4% p.a. SI.
2. A sum of Rs. 5000 is lent for 4 years at the rate of 5% p.a. at SI. Find the interest.
3. If the simple interest on Rs. 900 increases by Rs. 30 when the time increases by 2 years. Find the rate percent per annum.
4. A man deposited Rs. 5460 in a bank at 3% p.a. and Rs. 5980 in another bank at 7% p.a. Find the rate of interest for the whole sum.
5. The simple interest on a sum of money is \(\frac{9}{{16}}\) of principal, and the number of years is equal to the rate percent per annum. Find rate percent.
6. A sum was put on SI at a certain rate for 3 years. Had it been put at 5% higher rate it would have fetched Rs. 750 more, find the sum.
7. The SI on a sum of money will be Rs. 200 in after 5 year. For the next 7 years principal becomes 6 times, what will be the total interest at the end of 12 years.
8. A certain sum is invested for a certain time period. It amounts to Rs. 200 at 5% p.a. But when invested at 10% p.a., it amounts to Rs. 300. Find the time.
9. If the simple interest on Rs. 1660 be more than SI of 1560 Rs. by Rs. 30 in 5 years. Find the rate percent per annum.
10. If the simple interest on Rs. 440 increases by Rs. 55, when the rate percent increases by 5% p.a. Find the time.