It costs Charlie's Car Repair Shop $27 to change the oil. The shop charges their costumers $40 for an oil change. What is the percent of markup in the cost of an oil change?

Cost Price for oil change = $27

Charge for the customers = $40

Markup cost = Difference between selling price and cost price = $40-$27=$13

To find the percent of markup, divide the markup cost by the cost price and multiply it by 100.

Markup percent = (13/27) * 100

=48.15%