A stationer buy $5$ pens for Rs. $28$ and sells them at a profit of $25$ %. How much should a customer pay if he buys $3$ pen ?

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Solution

The amount at which the stationer sells the pen is the price the customer buys it for.
Given, for the stationer
C.P. of $5$ pens $= R s 28$
C.P. of $1$ pen $= R s 5.6$
Profit $= 25$ %
So, Profit % $= \frac{S . P . - C . P .}{C . P .} \times 100 = 25$
$=> \frac{S . P . - 5.6}{5.6} \times 100 = 25$
$=> S . P . - 5.6 = 1.4$
$=> S . P . = R s 7$
customer buys each pen for $= R s 7$
therefore cost for $3$ pens = $7 \times 3 = R s 21$

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A stationer buy 5 pens for Rs. 28 and sells them at a profit of 25%. How much should a customer pay if he buys 3 pen ?

A stationer buy $5$ pens for Rs. $28$ and sells them at a profit of $25$ %. How much should a customer pay if he buys $3$ pen ?