Question

if the CP 15 pens is equal to the selling price of 20 pens ,find the lost precent

Answer 1

Given that the cost price of 15 pens is equal to selling price of 20 pens:

⇒ 20 SP = 15 CP

⇒ 1 SP = 15/20 = 3/4 CP

Let y be the cost price of 1 pen.

Cost Price of 1 pen = y

Selling Price of 1 pen = 0.75y

Find the loss percentage:

Loss = y - 0.75y = 0.25y

Loss Percentage = (0.25y/y) x 100 = 25%

Answer: The lost is 25%