Answer:
Option C
Explanation:
Let rate of interest $=R\%$
Number of years $=N$
$4320$ $=3000\left(1+\frac{R}{100}\right)^{N}$
$\left(1+\frac{R}{100}\right)^{N/2}$ $=\sqrt{1.44}$ $=1.2$
In $\frac{n}{2}$ years Rs. $3000$ will amount to
$3000\left(1+\frac{R}{100}\right)^{N/2}$ $=3000\times 1.2$ = Rs. 3600.