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OpenStudy (anonymous):
A plumber charges $55 per hour plus a $50 service charge. Kevin hired the plumber to install a new hot water heater. What are the total charges if the plumber took 4 hours to complete the installation?
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Parth (parthkohli):
\[\LARGE = [55.4] + 50 = 220 + 50 = 270\]
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