COST, REVENUE, AND PROFIT A roofing contractor purchases a shingle delivery truck with a

Chapter 2, Problem 131

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COST, REVENUE, AND PROFIT A roofing contractor purchases a shingle delivery truck with a shingle elevator for $42,000. The vehicle requires an average expenditure of $6.50 per hour for fuel and maintenance, and the operator is paid $11.50 per hour. (a) Write a linear equation giving the total cost of operating this equipment for hours. (Include the purchase cost of the equipment.) (b) Assuming that customers are charged $30 per hour of machine use, write an equation for the revenue derived from hours of use. (c) Use the formula for profit to write an equation for the profit derived from hours of use. (d) Use the result of part (c) to find the break-even pointthat is, the number of hours this equipment must be used to yield a profit of 0 dollars.