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

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.

At the same rate of simple interest in percent per annum, if a principal becomes the amount of Rs 1248 in 7 years and or Rs 1056 in 4 years. Find the principal and rate of simple interest in percent per annum.

At the same rate of simple interest in percent per annum, if a principal becomes the amount of 7100Rs in 7 years and of 6200Rs in 4 years. Determine the principal and rate of simple interest in percent per annum.

A principal money is lent out at simple interest which sums to Rs 720 in 2 years and Rs 1020 in 5 years. Find the principal sum of money.

If the compound and simple interest of a certain principal in 2 years be Rs. 40.80 and Rs. 40 respectively, then find the principal and the rate of interest in percent per annum.

A sum of money amounts to Rs. 2400 in 3 years and Rs. 2520 in 4 years on C.I. Find the rate of interest.