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**