Question

pens are bought at 12 for a rupee and sold at 9 for a rupee. find the gain%

Answer 1

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%. 

Answer 2

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