A shopkeeper buys a certain number of pens if the selling price of a if the selling price of 5 pens is equal to the cost price of 7 pens find his profit and loss percentage
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let the CP of one pen be Re1
then CP of 7 pens=Rs.7
as given
SP of 5 pens = CP of 7 pens
so SP of 5 pens=Rs.7
therefore SP of one pen=7/5=1.4
Gain=1.4-1
=0.40
Gain%=(Gain*100)/CP
=(0.40*100)/1
=40%
then CP of 7 pens=Rs.7
as given
SP of 5 pens = CP of 7 pens
so SP of 5 pens=Rs.7
therefore SP of one pen=7/5=1.4
Gain=1.4-1
=0.40
Gain%=(Gain*100)/CP
=(0.40*100)/1
=40%
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