Question

1. A stationer buys pens at 5 for 28 and sells
them at a profit of 25%. How much should a
customer pay; if he buys
(1) only one pen ?
(ii) three pens?​

Answer 1

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%)/100 × C.P. of 1 pen

= ((100 + 25)/100) × Rs. 5.60 = Rs. 125/100 × 5.60

= Rs. (125 × 5.6)/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

Answer 2

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