A firm with a production function Q = KL (where K is units of capital and L is units of labor) has an expansion path that is given by K = 2L. The wage rate (W) is $20 and the rental on capital is $10. 
Assuming that the firm is using the optimal mix of inputs for any given output level, the quantity of output using one unit of labor is ____.
Definitions:
Loanable Funds
The money available for borrowing in the financial markets, influenced by interest rates and economic conditions.
Useful Life
The period during which an asset is expected to be usable for its intended purpose.
Interest Rate
The cost of borrowing money or the return on invested capital, typically expressed as a percentage of the principal amount per period.
Loanable Funds
The funds available in the financial markets for lending and borrowing.
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