A man makes 20% profit by selling watch for 500. Find cp​

Given,

To find out the selling price.

Where cost price(C.p)=500 Rs. & gain =25% as we know that,

Selling price(S.P)=[

100

100+Gain%

]× Cost price (C.P)

We get here,

S.P=[

100

100+25

]×500

=

100

125

×500

⇒125×5

⇒625

what i would say the best answer is a. 40.5