I Need Help- word problem - writing an equation

Question

Abby owns a sporting goods shop .She buys football jeseys for $20.00 each an sells them for $45.00 each. What is the percent markup of the jeseys?

 A; Write an abgebraic equation for the problem?

 B: solve the equation an label your answer

Answer 1

Let C=cost price and S the selling price. The markup percentage M=100S/C-100 or M=100(S/C - 1) or M=100(S-C)/C.

C=$20, S=$45, M=100*45/20-100=225-100=125%.