This word problem is expressed simply which can be confusing to some. Take your time and focus on the what is being asked for.
Discount, tax, and tip word problems is a free educational video by Khan Academy.It helps students in grades 7 practice the following standards 7.RP.A.3.
1. 7.RP.A.3 : Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error..