Use the following to answer questions: 
-(Table: Variable Costs for Lawns) Look at the table Variable Costs for Lawns. During the summer, Alex runs a lawn-mowing service, and lawn-mowing is a perfectly competitive industry. Assume that costs are constant in each interval; that is, the variable cost of mowing 1 through 10 lawns is $100. His only fixed cost is $1,000 for the mower. His variable costs include fuel, his time, and mower parts. If the price for mowing a lawn is $40, how much is Alex's profit per unit at the profit-maximizing output?
Definitions:
Clearances
The space or gap between two parts, typically measured to ensure proper fit, alignment, or function.
Warpage
Distortion or deformation of a material or component, often caused by uneven heating, cooling, or stress.
Bonds
Financial instruments representing a loan made by an investor to a borrower, often a corporation or government, which pays interest over time and returns the principal at maturity.
Atoms
The smallest constituent unit of ordinary matter that has the properties of a chemical element.
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