Correct Answer - Option 4 : 25% loss
Given:
The cost price of 15 pens is equal to the selling price of 20 pens.
Concept Used:
Profit = [(selling price – cost Price)/cost price} × 100]%
Calculation:
Cost price(C.P.) of 15 pen = Selling price(S.P.) of 20 pens
⇒ 15 × C.P = 20 × S.P
⇒ C.P/S.P = 20/15
⇒ C.P/S.P = 4/3
Let, C.P be 4x and S.P be 3x
Profit = {(3x – 4x)/4x} × 100%
⇒ -100/4
⇒ -25%
Profit is ( -25)% that means loss is 25%
∴ Loss is 25%