2011 AMC 12A Problems/Problem 1

Problem

A cell phone plan costs dollars each month, plus cents per text message sent, plus cents for each minute used over hours. In January Michelle sent text messages and talked for hours. How much did she have to pay?

Solution

The base price of Michelle's cell phone plan is dollars. If she sent text messages and it costs cents per text, then she must have spent cents for texting, or dollars. She talked for hours, but will give us the amount of time that she has to pay an additional amount for. hours minutes. Since the price for phone calls is cents per minute, the additional amount Michelle has to pay for phone calls is cents, or dollars. Adding dollars dollars .