IF the cost of 5 pens is

equal to selling price of 4

pen of same kind, Find profit

percentage.

here your answer

Step-by-step explanation:

let cp of one pen be x

cp of 5 pen = 5x

cp of 5 pen = sp of 4 pen

5x = sp of 4 pen

4x = cp of 4 pen (cp of 1 pen = x)

profit = 5x-4x

= x

profit % = profit / cp * 100 = x/4x * 100

= 25 %