A real estate office handles, say, 50 apartment units. When the rent is, say, $600 per month, all the units are occupied. However, for each, say, $40 increase in rent, one unit becomes vacant. Moreover, each occupied unit requires an average of $27 per month for maintenance. How many units should be rented to maximize the profit?

Write a program that prompts the user to enter:

a. The rent to occupy all the units.
b. The increase in rent that results in a vacant unit.
c. Amount to maintain a rented unit.
The program then outputs the number of units to be rented to maximize the profit.

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