SOLUTION: a plumber charged $110 for three-hour job and $160 for a five-hour job. At this rate, how much would he charge for an eight-hour job?

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Question 156327This question is from textbook Algebra and Trigonometry Structure and Method Book 2
: a plumber charged $110 for three-hour job and $160 for a five-hour job. At this rate, how much would he charge for an eight-hour job? This question is from textbook Algebra and Trigonometry Structure and Method Book 2

Answer by gonzo(654) About Me  (Show Source):
You can put this solution on YOUR website!
3h = 110
5h = 160
5h - 3h = 50 becomes
2h = 50
h = 25.
looks like plumber is charging 25 per hour plus a fixed cost.
for 3h job fixed cost = 110 - 75 = 35 dollars.
for 5h job fixed cost = 160 - 125 = 35 dollars.
so fixed cost is 35 dollars plus 25 dollars per hour.
based on that, 8h job should be 35 + (8 * 25) = 235 dollars.