What-is-the-maximum-number-of-hours-that-the-repair-person-can-work-math-homework-help

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Gloria’s washing machine is broken. Since her machine is pretty old, she doesn’t want to spend more than $100 for repairs. A service call will cost $35 and the labor will be an additional $20 per hour. There are no other charges. What is the maximum number of hours that the repair person can work without the total cost exceeding $100? Please explain how you arrived at your answer. Thanks!