Question

the simple interest of some amount of money is rupees 1200 in 3 years and the compound interest of the same amount

Answer 1

You need either rate of interest or principal amount to solve further.Simple interest = P x r x T

1,200 = P x r x 3  => P x r = 400

Compound interest of same amount in 3 years at same rate of interest.

A = P x (1 + r)^3