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 total cost when using one unit of labor is $____.
Definitions:
Independent Variable
In an experiment, the variable that is manipulated or changed to test its effect on the dependent variable.
Cause-effect Relationships
The connection between two events where one event makes the other happen.
Correlational Research
A research method used to examine the relationship between two or more variables, without implying causation.
Experimental Research
A scientific approach that seeks to establish cause-and-effect relationships by manipulating and controlling variables.
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