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Question
The C.P. of 12 pens is same as S.P. of 15 pens. Calculate the profit or loss percent made, if all the pens bought are considered to be sold.
Solution
C.P. of 12 pens = S.P. of 15 pens = Rs. 100 (suppose)
∴ C.P. of 1 pen =`100/12` = Rs. 8.33
and S.P. of 1 pen = `100/15` = Rs. 6.67
∴ Loss = C.P. - S.P.
= Rs. 8.33 - Rs. 6.67
= Rs. 1.67
Loss % =`("Loss" xx 100)/"C.P."`
`= (1.67 xx 100)/8.33`
`= (166 xx 100 xx 100)/(100 xx 833)`
= 19.93 %
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