m. A merchant sold 12 pens in 27 and earned a profit equivalent to the purchase price of 3
pens. Find the purchase price of each pen and percentage of profit or loss.
(Ans. *1.8; Profit 25%
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Step-by-step explanation:
Let the CP of 1pen be x
CP of 12pen= 12x
Profit = CP of 3pen= 3x
according to question
12x+3x= 27
15x = 27
x= 27/15
Hence
CP of 1pen= 27/15
= 1.8
profit= 3x
= 3*1.8
= 5.4
CP = 27-5.4
= 21.6
profit%=( 5.4/21.6)*100
=(1/4)*100
= 25%
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