An amount of money invested trebled in 6 years . Find the rate of interest earned .

The interest on a certain sum of money is 0*24 times of itself in 3 years. Find the rate of interest.

A sum of money doubles itself in 8 years. What is the rate of interest?

A sum of 16,000, invested at simple interest, amounts to 22,400 in 4 years at a certain rate of interest. If the same sum of money is invested for 2 years at the same rate of interest, compounded p.a., find the compound interest earned.

The simple interest on a certain sum of money is 3/8 of the sum in 6""1/4 years. Find the rate percent charged.

A sum of money lent out at simple interest amounts to ₹20,000 in 1 year and to ₹30,000 in 5 years. Find the rate of interest and some of money.

A sum of money lent out at simple interest amounts to ₹1900 in 1 year and to ₹2800 in 4 year. Find the rate of interest and the sum of money.

A sum of Rs. 16000 earns a simple interest of Rs. 2560 in 2 years. Find the rate of interest per annum.

A sum of money, lent out at simple interest, doubles itself in 8 years. Find : (i) the rate of interest. (ii) In how many years will the sum become triple (three times) of itself at the same rate percent ?

a. A sum of money doubles itself in 4 years at a certain rate of interest. In how many years will it triple itself at the same rate of interest ? b. A sum of money trebles itself in 6 years at a certain rate of interest. In how many years will it become four times itself at the same rate of interest ?

A man invests ₹2000 for 3 years. He also invests ₹1600 for 3 years at a rate 2% higher than the first one. He earns an interest of ₹996 at the end of 3 years. Find the rates of interest in both the cases.