A man buys 35 pens for a rupee. How many pens should he sell for a rupee to earn a profit of 40 percent?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 25.
The man buys 35 pens for Rs. 1
⇒ C.P. per pen = 1/35 rupees/pen
To earn 40% profit
⇒ S.P. = C.P. × (1 + 40%)
⇒ S.P. = C.P. × (1 + 0.40)
⇒ S.P. = 1/35 × 1.40
⇒ S.P. = 1/25 rupees
Thus, S.P. per pen is Rs. 1/25
The number of pens sold for Rs.1 = Rs.1/Rs. 1/25/pen
⇒ 1/1/25 = 25 pens
Therefore, to earn a 40% profit, he should sell 25 pens for 1 rupee