We have, Principal value = Rs. 500 Interest rate = 10% annually ∴ Amounts at the end of successive years form the G.P. Rs. 500 $\left(1+\frac{10}{100}\right)$ , Rs. 500 $\left(1+\frac{10}{100}\right)^2$ , Rs. 500 $\left(1+\frac{10}{100}\right)^3$ , ... ∴ Amount paid by bank after 10 years will be A = Rs. 500 $\left(1+\frac{10}{100}\right)^{10}$ = Rs. 500 $(1.1)^{10}$