If the selling price of 10 pens is the same as the cost price of 12 pens then gain per cent is
Let × be the CP of Pen
SP of 1 pen = x/10
CP of 1 Pen = x/12
Gain = SP –CP
= x/10 – x/12
=x/60
= 20%
7
If the selling price of 10 pens is the same as the cost price of 12 pens then gain per cent is
Let × be the CP of Pen
SP of 1 pen = x/10
CP of 1 Pen = x/12
Gain = SP –CP
= x/10 – x/12
=x/60
= 20%