Question : A person borrowed some money at simple interest. After 4 years, he returned $\frac{9}{5}$th of the money to the lender. What was the rate of interest?

Question : A man borrowed some money from a private organisation at 5% simple interest per annum. He lent this money to another person at 10% compound interest per annum and made a profit of Rs. 26,410 in 4 years, the man borrowed:

Question : If a sum of money becomes Rs. 4000 in 2 years and Rs. 5500 in 4 years and 6 months, at the same rate of simple interest per annum, the rate of simple interest is:

Question : Rohan borrowed a certain sum of money at simple interest. The rate of interest was 3% per annum for the first 3 years, 4% per annum for the next 5 years and 6% per annum for the next 7 years. If he paid Rs. 2,059 as interest, then what is the sum borrowed (in Rs.)?

Question : A sum becomes Rs.15,500 in 7 years on simple interest at the rate of 30 percent per annum. What is the total interest for the 7 years?