Answer is C
Case 1
Let CP = x, P=15%, so SP =$\frac{115x}{100}$
Case 2
CP = $\frac{90x}{100}$, P=25%, SP = $\frac{115x}{100}-4$
CP * $\frac{125}{100}$ = SP, substituting for CP and SP from above,
$\frac{90x}{100}$* $\frac{125}{100}$ =$\frac{115x}{100}-4$
On solving, we will get x = Rs.160