An entrepreneur is considering how many limousines to purchase when he starts up a limousine service. Below are his estimates of the number of limousine rentals the service will make during a year, depending on the number of limousines available. 
After paying all non-interest expenses, the owner expects to net $10 per rental. Each limousine costs $50,000. How many limousines should he purchase if the real interest rate is 6.5%?
Definitions:
Electrical Noise Interference
Unwanted disturbances superimposed on a useful signal that degrade the quality of signal transmission or processing.
Logic Circuits
Electronic circuits that employ logic gates to perform specific logical operations, resulting in binary output based on one or more binary inputs.
Discrete Output Module
An output module in PLCs and other control systems that deals with discrete (on/off) signals, controlling various devices based on program logic.
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