In what time will the simple interest be $$ {2\over5} $$ of the principal at 8% per annum? 

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

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

The total sum of amounts of A and B at the end of 4 years and 2 years respectively on the same principal is Rs. 20,020. If A is charged Simple interest at the rate 10% and B is charged Compound interest at the rate 5%. The principal is?

The difference between the compound interest and simple interest of a certain sum of amount is rupees 256.40 for 4 years at 10% rate per annum. Find the sum of money?

A sum of money at double the rate of simple interest doubles itself in 10 years. In how much time will that amount be triple of itself?

If the simple interest on ₹ 1 for 1 month is 1 paisa, then the rate percent per annum will be 

The effective annual rate of interest corresponding to a nominal rate of 6% per annum payable half yearly is: