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:
Government Spending
Expenditures made by the government sector on goods and services, including salaries of public servants, public investments, and social security benefits.
Aggregate Demand
The collective requirement for goods and services in an economy, determined at a particular price point over a defined period.
Taxes
Compulsory contributions to state revenue, levied by the government on workers' income and business profits, or added to the cost of some goods, services, and transactions.
Aggregate Demand
The collective call for goods and services in an economy, marked at a certain price level for a given time interval.
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