Question

A hawker gains the selling price of 4 baĺl-point pens on selling 1 dozen pens. What is his gain percent?

Answer 1

Answer:

50%

Step-by-step explanation:

let Cost price of one pen be x and Selling price by y.

gain on dozen pens = 12y - 12x

this is given to be equal to Selling price of 4 pens. i.e. 4y

therefore 12y - 12x = 4y

8y = 12x

y = 1.5x

gain % on selling one pen = 100 * (y-x)/x = 100 * 0.5 = 50%