## Intermediate Algebra for College Students (7th Edition)

Let x = number of times a bus is used. At no discount, total cost = $1.25x$ With the discount, total cost = $0.75x+15$ To find when the total costs will be equal, solve $1.25x=0.75x+15\qquad$ ... subtract $0.75x$ $0.5x=15\qquad$ ... multiply with 2 $x=30$ Total costs will be equal when the bus is used 30 times in a month