A principal amounts Rs. 1210 and Rs. 1331 respectively in 2 years and 3 years at the rate of compound interest. Calculate the principal.

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 principal amount of Rs. 45000 gives Rs. 54000 as a simple interest in 6 years. Find the simple interest on half of the principal amount for 3 years at the same rate of interest?

If a principal beocmes Rs 560 in 3 years and Rs 600 in 5 years at the same rate of simple interest in percent per annum, then find the principal and the rate of simple interest in percent per annum.

Fill in the blanks If the principal of 1st year at the rate of r% compound interest is RsP, then the principal of 2nd year is Rs___.

A certain principal amounts Rs2750 in 2 years at a rate of simple interest of 5% per annum. Then find the rate of simple interest in percent per annum for which the principal amounts Rs3000 in 2 years.

Total amount (principal+compound interest) in 2 years of Rs 400 is Rs 441. Find the rate of compound interest per annum.