Use the following to answer questions: 
-(Table: Production Function for Soybeans) Look at the table Production Function for Soybeans. Assume that the fixed input, capital, is 10 acres of land and a tractor, which have a combined cost of $150 per day. The cost of labor is $100 per worker per day. The variable cost of producing 45 bushels of soybeans is:
Definitions:
Variable-frequency Drive
A system used to control the speed of an electric motor by varying the frequency and voltage supplied to the electric device.
Motor Controller
A device that regulates the performance of an electric motor by varying parameters such as voltage and current.
PWM
Pulse Width Modulation, a technique used to control the amount of power delivered to an electrical device by varying the duty cycle of a pulse signal.
Four-quadrant
Refers to operating modes of a drive or control system that can handle both positive and negative directions of both power and torque in all four quadrants of operation.
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