A plumbing company charges $50 for the first hour of a service call and $30 per hour for each hour or part of an hour that a job

Question

A plumbing company charges $50 for the first hour of a service call and $30 per hour for each hour or part of an hour that a job requires after the first hour. If the Smiths bill included $65 for supplies and the plumber worked 2 hours and 35 minutes, how much was their bill?

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