By applying formulas for computing simple and compounding interest rates, we get:

Let Sum = X

Simple interest formula value = X x 0,1 x 3 = 0,3 X

Compound interest formula value = X x ( ( 1 + 0,1 )^ 3 - 1 )) = 0,331 X

Then

0,331 X - 0,3 X = 46,50

X = Rs 1500