Use the following to answer questions: 
-(Table: Variable Costs for Lots) Look at the table Variable Costs for Lots. During the winter, Alexa runs a snow-clearing service in a perfectly competitive industry. Assume that costs are constant in each interval; that is, the variable cost of clearing anywhere from 1 through 10 lots is $200. Her only fixed cost is $1,000 for a snowplow. Her variable costs include fuel, her time, and hot coffee. If the price to clear a lot is $30, what is Alexa's profit per unit at the optimal output?
Definitions:
Cross Rate
The exchange rate between two currencies, calculated based on their respective exchange rates with a third common currency.
Exchange Rates
The value of one currency expressed in terms of another currency.
Exchange Rate Fluctuations
Variations in the value of one currency relative to another, which can affect the profitability of international investments and trade.
Deferred Payment
A delayed payment agreement which allows the buyer to take possession of goods or services upfront and pay for them at a later date.
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