15. Karan purchased one dozen pens ...
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15. Karan purchased one dozen pens for 120 and sold a pack of 3 pens for 35 each. What is his gain? (1) 16.67 % (2) 20% (3) 15% (4) 33.33%

11th - 12th Class
Maths
Solution
65
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15. (1) Cost price of one dozen pens ( =₹ 120 ) Cost price of 1 pen ( =frac{120}{12}=₹ 10 ) Selling price of 3 pens ( =₹ 35 ) Selling price of 1 pen ( =₹ frac{35}{3} ) ( begin{aligned} therefore text { Gain percentage } &=frac{frac{35}{3}-10}{10} times 100=frac{5}{3} times 10 &=16.67 % end{aligned} )
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