Answer the question on the basis of the following information: Suppose 30 units of product A can be produced by employing just labor and capital in the four ways shown below. Assume the prices of labor and capital are $2 and $3, respectively. 
Which technique is economically most efficient in producing A?
Definitions:
Total Revenue
The total income generated from the sale of goods or services before any expenses are subtracted.
Long Run
An economic period in which all inputs, including capital, can be adjusted, allowing firms to fully adapt to market changes.
Output
The total amount of goods and services produced by an economy or a production process over a certain period of time.
Marginal Cost
The cost of producing one additional unit of a product or service, which varies depending on the level of production.
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