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 Solution By selling 100 pencils, a shopkeeper gains the selling price of 20 pencils. Find the gain percent.Solution:Your problem -> By selling 100 pencils, a shopkeeper gains the selling price of 20 pencils. Find the gain percent.(S.P. of 100 pencils) - (C.P. of 100 pencils) = S.P. of 20 pencils.:. S.P. of 80 pencils = C.P. of 100 pencils Let C.P. of each pencil be Rs. 1C.P. of 80 pencils = Rs. 80S.P. of 80 pencils = Rs. 100:. Gain % = ("Gain" × 100)/("C.P.") = (20 × 100)/80 = 25 % Solution provided by AtoZmath.com Any wrong solution, solution improvement, feedback then Submit Here Want to know about AtoZmath.com and me