By selling 2

By selling 100 pens, a shopkeeper gains the selling price of 20 pens. Find his gain percent.

Correct answer:

p =  25 %

Step-by-step explanation:

100 r a= 20 (1+r)a  100r=20(1+r)  100 r=20 (1+r)  80r=20  r=8020=0.25  r=41=0.25  p=100 r=100 0.25=25%



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