Multiple choice

Vijay bought some pens for Rs. 540. He lost 2 pens. Then, he sold each of the remaining pens at Rs. 6 more than the cost price. On the whole transaction, Vijay gained 10% on his outlay. How many pens did Vijay buy?

  1. 24

  2. 22

  3. 20

  4. 18

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let x be the number of pens. Cost per pen = 540/x. Selling price per pen = (540/x) + 6. Total SP = (x - 2) * (540/x + 6). Profit is 10% of 540, which is 54, so SP = 594. Solving (x - 2)(540/x + 6) = 594 leads to x = 20.