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 three units of labor is ____.
Definitions:
Risk-Free Rate
The theoretical rate of return of an investment with no risk of financial loss, typically associated with government bonds.
Market Risk Premium
The additional return an investor expects to receive from holding a risky market portfolio instead of risk-free securities.
Beta Coefficient
A measure of a stock's volatility in relation to the overall market, used in the Capital Asset Pricing Model to determine the expected return of the asset.
Systematic Risk
The danger that affects the whole market or a specific segment of the market, commonly referred to as market risk.
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