The compound interst on a certain sum at a certain rate of interest for the 2nd year is Rs 720, and for the 3rd year is Rs 864. Find the principal and rate of interest.

The compound interest on a certain sum at a certain rate of interest for the second year and third year is Rs 21780 and Rs. 23958 respectively. What is the rate of interest ?

A= Rs. 7920, I= Rs. 720 and, T = 2 years. Find the principal and rate of interest.

By compound interest, the interest of a sum in the 2nd year is Rs. 880 and the interest in the 3rd year is Rs. 968. Find the rate of interest and the sum.

If the simple interest of a certain sum of money for 1 year is Rs. 50 and compound interest for 2 years is Rs. 102, then find the sum of money and the rate of interest.

The compound interest on a certain sum for 2 years is Rs 882, whereas the simple interest on it is Rs 840. Find the rate of interest.