Let the sum of money = $$Rs. 1000x$$ Rate of interest under compound interest = 10% and time = 3 years Amount = $$P(1+frac{R}{100})^T=6655$$ => $$1000x(1+frac{10}{100})^3=6655$$ => $$1000x(frac{11}{10})^3=6655$$ => $$1000x imes frac{1331}{1000}=6655$$ => $$1331x=6655$$ => $$x=frac{6655}{1331}=5$$ $$ herefore$$ Sum = $$1000 imes 5=Rs. 5000$$ => Ans - (A)