Question

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8. A roofer charges $60 for the first hour of a service call and $20 per hour for
each additional hour, as shown on the graph below.
?
Plumber's Prices
Price (in dollars)
(3, 100)

Answer 1

y=60+25h+0.3r

Explanation:

let y be the total charges

given that the hour is h

and the cost for raw material is r

therefore

1. The first hour of service call = $60

2. For each additional hour= 25h

3. 30% over the cost of the materials.= 30/100*r=0.3r

total charges

y=60+25h+0.3r

therefore the expression is

y=60+25h+0.3r