Find the compound interest on Rs.15625 for $1\frac{1}{2}$  years at $8\%$  per annum when compounded half yearly

$A=15625\times {\left(1+\frac{4}{100}\right)}^3$

$=15625\times {\left(1+\frac{1}{25}\right)}^3$

$=15625\times \frac{26}{25}\times \frac{26}{25}\times \frac{26}{25}=\text{Rs}.17576$

Compound interest $=17576-15625=\text{Rs}.1951$