SOLUTION: A carpenter charges a set fee for a job in addition to an hourly charge. He charges first customer $150 for a 3 hr job. He charges another customer $180 for a 6 hr. job. How muc

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Question 149129: A carpenter charges a set fee for a job in addition to an hourly charge. He charges first customer $150 for a 3 hr job. He charges another customer $180 for a 6 hr. job. How much would he charge for a 9 hr. job?
Answer by mangopeeler07(462) About Me  (Show Source):
You can put this solution on YOUR website!
$150 for a 3 hr job. $180 for a 6 hr. job.

Jobs differ by three hours and thirty dollars, so ten dollars an hour.

Base price=price for three hours minus ten per hour
Base price=150-10(3)
150-30
Base price=120

10 dollars an hour, so total price=
base price plus price per hour times the hours

total price of nine hours=
120+10(9)
120+90
210

Price for nine hours:
$210