Question : A man buys 15 pens for a rupee. How many pens should he sell for a rupee to earn a profit of 50 percent?
Option 1: 6
Option 2: 8
Option 3: 10
Option 4: 12
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Correct Answer: 10
Solution : The man buys 15 pens for a rupee, so the cost price of each pen is $\frac{1}{15}$ rupees. To earn a profit of 50%, the selling price of each pen should be $\frac{1}{15} ×\frac{150}{100}= \frac{1}{10}$ rupees If in $\frac{1}{10}$ rupees he sells 1 pen, then in Re. 1, he sells 10 pens. Hence, the correct answer is 10.
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