Question

By selling 20 pens a shopkeeper gains equal to the sp of 4 pens calculate gain %

Answer 1

selling 20 pens a shopkeeper gain equal to SP of 4pen

so,

20(SP - CP)  =  4SP

5(SP - CP) = SP

5SP - 5CP = SP

4SP = 5CP

SP = 5CP/ 4

gain = SP - CP = 5CP/4 - CP

(5CP - 4CP)/4 = CP/4

gain percent = (CP/4)/CP x 100 = 25%

Answer 2

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