Question

11. What sum of money lent out at 5% for 3 years will produce the same interest as
900 lent out at 4% for 5 years?
Find : () the rate of interest.
(1) the sum that will become ? 810 in 7 years at the same rate of interest
13. A sum amounts to 2 2,652 in 6 years at 5% pa. simple interest.
Find : (0) the sum
(ii) the time in which the same sum will double itself at the same rate of interest
14. P and Q invest 36,000 and 25,000 respectively at the same rate of interest per
year. If at the end of 4 years, P gets ? 3,080 more interest than Q, find the rate of
interest
15. A sum of money is lent for 5 years at R% simple interest per annum. If the interest
earned be one-fourth of the money lent, find the value of R.
16. The simple interest earned on a certain sum in 5 years is 30% of the sum. Find the
rate of interest
12. A sum of 1.780 becomes 2.136 in 4 years.​

Answer 1

11. answerQ11) What sum of money lent out at 5% for 3 years will produce the same interest as Rs. 900 lent out at 4% for 5 years? ∴SI=\frac{PRT}{100}=\frac{900\times4\times5}{100}=180Rs.