Fish181 wrote:
Riya plans to order 95 custom shirts for the participants of a fundraising event she is organizing. She is considering two options for ordering the shirts—a local option where she would have no shipping costs and an option to order the shirts online and have them shipped to her. If she uses the local option, each shirt will cost $x. If she uses the online option, each shirt will cost slightly less, at $y, but she will have to pay a flat shipping fee of $22. These are the only costs associated with ordering the shirts. Riya correctly determined that by ordering the 95 shirts using the online option rather than the local option, she will spend exactly $16 less.
Let us work out the cost under both options.
Local Option: 0$(shipping cost) + $95x(at the rate of $x per shirt)
Onlne Option: 22$(shipping cost) + $95y(at the rate of $y per shirt), where y<x
Local cost - Online cost = $16
95x-(22+95y)=16
95(x-y)=38
x-y = 38/95 = 0.4
Look for options that have a difference of 0.4 => 12.50-12.10Thus, x=12.50 and y=12.10