On what sum will the difference between the simple and compound interest for 3 years at 20% percent per annum amounts to Rs 66.56?
We have the formula: Difference = (PR2 (300 + R))/(100)3 66.56 = (P× (20)2× (300 + 20))/(100)3 P = (66.56× 100× 100× 100)/(20× 20× 320) P = Rs. 520