Answer:
Option C
Explanation:
The difference in C.I. and S.I. for 3 years is given by
$C.I.-S.I$ $=P\{\left(\frac{R}{100}\right)^{3}$ $+3 \left(\frac{R}{100}\right)^{2}\}$
$\Rightarrow 15 \frac{1}{2}$ $=P\{ \left(\frac{10}{100}\right)^{3}$ $+3 \left(\frac{10}{100}\right)^{2}\}$
$\Rightarrow \frac{31}{2}$ $=P\left[\frac{1}{1000}+\frac{3}{100}\right]$
$P$ $=\frac{31}{2}\times\frac{1000}{31}$ = Rs. 500.
