What would be the interest accrued in two years if ₹ $800$ is invested @ $10\%$ interest compounded annually?

Given:
Principal ($P$) = ₹ $800$
Rate of Interest ($R$) = $10\%$ per annum
Time ($n$) = $2$ years

Formula for total Amount ($A$) under compound interest:

$$A=P{\left(1+\frac{R}{100}\right)}^n$$

$$A=800{\left(1+\frac{10}{100}\right)}^2$$

$$A=800{\left(\frac{11}{10}\right)}^2$$

$$A=800\times \frac{121}{100}=8\times 121=\text{₹ }968$$

Formula for Compound Interest ($\text{CI}$):

$$\text{CI}=A-P$$

$$\text{CI}=968-800=\text{₹ }168$$

Thus, the interest accrued in two years is ₹ $168$.