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28 March, 22:53

A plumber charges an initial amount to make a house call plus an hourly rate for the time he is working. A 1 hour job costs $90 and a 3 hour job costs $210. What is the initial amount and hourly rate that the plumber charges. Show work.

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  1. 28 March, 23:54
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    He charges 30 as the intial amount and 60 per hour (60 plus 30 is 90 and 60 times 3 is 180 plus 30 is 210)
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