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 two units of labor is $____.
Definitions:
Internal Combustion Engines
Engines in which fuel is burned within the engine itself to create power, commonly used in vehicles.
Nuclear Fission
A nuclear reaction in which a heavy nucleus splits into lighter nuclei, releasing energy in the process.
Nuclear Warheads
Explosive devices powered by nuclear reactions, capable of causing immense destruction when detonated.
Assimilation
The process by which individuals or groups of differing ethnic heritage are absorbed into the dominant culture of a society.
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