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 = (PR^{2} (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

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