The answer of this question would be, X=200

By following steps

25%of X= 50

or,X=200(ans.)

Simran ;

We are looking after selling the watch at 25% profit.

If it is to cost X rs more we would need 25% of X to maintain the rate of profit.

The extra profit is 50 ; which is 25% of X.

Now, we can say

X* 25/100 = 50

X= 200

Therefore, the value of X is 200 rupees.