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Question
A stationery buys pens at 5 for Rs.28 and sells them at a profit of 25 %. How much should a customer pay; if he buys
(i) only one pen ;
(ii) three pens?
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Solution
For Stationery :
C.P. of 5 pens = Rs.28
C.P. of 1 pen =`28/5`Rs. = Rs.5.60
profit = 25%
∴ S.P. of 1 pen
`=((100+"Profit"%))/100xx"C.P. of 1 pen"`
`=((100+25))/100xx"Rs."5.60`
= Rs. `125/100xx5.60`
= Rs. `(125xx5.6)/100`= Rs. 5 × 1.4 = Rs.7
S.P. of 3 pens = 3 × 7 = Rs.21
∴ Customer pays for
(i) only one pen = Rs.7
(ii) Three pens = Rs.21
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