Question

A shopkeeper buys a certain number of pen if the selling price of a 5 pen is equal to the cost price of 7 then find his profit or loss percentage

Answer 1

Answer:

40%

Step-by-step explanation:

Define x:

Let the cost price of 1 pen be x

Find the selling price of 1 pen:

5 pens = 7x

1 pen = 7x ÷ 5 = 7/5 x

Find the profit/loss

7/5 x > x ⇒ It is a profit

Profit = Selling Price - Cost Price

Profit = 7/5 x - x = 2/5 x

Find the profit percentage:

Profit Percentage = (Profit ÷ Cost Price) x 100

Profit Percentage = (2/5 x ÷ x ) x 100

Profit Percentage = 40%

Answer: The profit is 40%