Original cost of a pair of shoes = $40
Percentage by which the price of the pair of shoes is marked up = 25%
Then
Amount by which the price
of the pair of shoes is marked up = (25/100) * 40 dollars
= 40/4 dollars
= 10 dollars
So
The selling price of the shoe now = (40 + 10) dollars
= 50 dollars
So we can see from the above deduction that the price of the pair of shoes was marked up by $10 and the selling price of the pair of shoes is $50. I hope the procedure is clear enough for you to understand.