A sum lent at compound interest amounts to 72.8% more than itself in 3 years, interest compounded annually at a certain rate per cent per annum. What will be the compound interest (in ₹) on a sum of, ₹18,000 for $$1\frac{1}{2}$$years at the same rate, if the interest is compounded six-monthly'?

A

6,897

B

5,598

C

7,654

D

5,958