A certain bridge charges a toll of $0.80 for each crossing. For regular users, there is an option to buy a monthly sticker for $15.00, which reduces the toll to $0.25 per crossing during that month. If a driver plans to cross the bridge three times on each of y days next month and will not cross on any other days, what is the minimum value of y for which this driver can save money by purchasing the sticker?

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The cost for the driver for 3y (three times on each of y days) crossings without the sticker will be:

3y*0.80

; The cost for the driver for 3y crossings with the…

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What this question tests

Your ability to manipulate linear and quadratic expressions, substitute unknowns, and solve equations under time pressure.

Losing a sign when moving terms across the equals sign, or dividing both sides by a variable that could equal zero.