Delhi Police Constable 1 Dec 2020 Shift 3 Paper

A sum of Rs. 12,000 amounts to Rs. 20,736 in $1\frac{1}{2}$ years at a certain rate per annum on compound interest, compounded half yearly. What will be the compound interest (in Rs.) of the same sum in 2 years at the same rate on compound interest. If the interest is compounded annually?