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 $70, how much is Alex's profit per unit at the profit-maximizing output?
Definitions:
Expectancy
The anticipated outcome or occurrence of an event, often used in the context of probability or investment returns.
Imputed Interest
The interest rate that is considered or assumed in the calculation of the cost of a decision, not explicitly paid.
Residual Income
The amount of income that an individual has after all personal debts and expenses have been paid from his or her earnings.
Return On Investment
A financial metric used to evaluate the efficiency of an investment, calculated as net profit divided by the initial cost of investment.
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