Which amount will be Rs 520 in 5 years with simple interest and Rs 568 in 7 years?

A sum of money at simple interest amount to Rs.4800 in 3 years and Rs.5600 in the 5 years. The sum is

Find the simple interest on a principal of Rs.1250 at the rate of 5% for a time of 219 days.

The simple interest and the true discount on a certain sum for a given period and at a given rate are 25 and 20 respectively. The sum is 

If the difference of interest of two banks of Rs 500 is Rs 2.50, find the difference between their rates.

Any money at the rate of simple interest becomes Rs 1143 in 3 years and Rs 1305 in 5 years Find the rate of principal and interest.

Rs. 2,000 is invested at 10% p.a. on simple interest. If that interest is added to the principal after every 20 years, the amount will become Rs. 14,000 after

The difference between simple interest and compound on Rs. 1200 for one year at 10% per annum reckoned half-yearly is: