16. Compute the compound interest

Find the compound interest at the rate of 11.5 $\%$ per annum for 3 years on the principal, which in 7 years at the rate of 9.3 $\%$ per annum gives 3047 as simple interest. (Use: ${\left(1.115\right)}^3$ $\approx$ 1.386)

 

Answer:

 

The compound interest $=$ $₹$.

 

[Note: Submit the answer a whole whole number.]