Answers

2015-06-12T12:44:59+05:30
Pens are bought at 12 for a rupeeSo cost price of 12 pens = Re. 1
So cost price of 1 pen =Rs.  \frac{1}{12}

It is sold at 9 for a rupee
So selling price of 9 pens = Re. 1
So selling price of 1 pen =Rs.  \frac{1}{9}

gain =  \frac{1}{9}-  \frac{1}{12} =  \frac{4-3}{36}= \frac{1}{36}

gain % =  \frac{gain}{CP} \times 100=  \frac{1/36}{1/12} \times 100=  \frac{12}{36} \times 100= 33.33%

Gain is 33.33%. 

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2015-06-12T12:54:30+05:30
C P= 12
S P= 9
GAIN= 12 X 9/ 100
NOW FIND THE ANWER
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