A certain sum becomes Rs. 1020 in 5 years and Rs. 1200 in 8 years at simple interest. What is the value of principal? 

Equal sum of money are lent to X and Y at 7.5 % per annum for a period of 4 years and 5 years respectively. If the difference in interest, paid by them was 150, the sum lent to each was 

How much simple interest will be received in 10 years on the amount of Rs. 1600? If the rate of interest is 7.25 percent per annum.

If the instalments are paid at the end of every year, what annual payment will discharge a debt of Rs. 7,200 due in 3 years at 20% per annum simple interest?

In how many years will Rs 4600 amount to Rs 5428 at 3 % per annum simple interest?

A person invested Rs 28000 at the rate of 8% per annum simple interest and Rs 26000 at the rate of 10% per annum compounded Interest compounded annually. What is the difference in the interest earned from two investments at the end of 3 years? 

A person invested a sum of Rs. 18,600 at x% per year and another sum that is twice the former at (x+2)% per year, both at simple interest. If the total interest earned on both investments for years is Rs.23,110.50, then the rate of  interest per year on the second investment is:

The simple interest on a certain sum of money at the rate of 5 % per annum for 8 years is ₹ 840. Rate of interest for which the same amount of interest can be received on the same sum after 5 years is?