C++ (Apartment problem) 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?

Instructions

Write a program that prompts the user to enter:

1. The total number of units.
2. The rent to occupy all the units.
3. Amount to maintain a rented unit.
4. The increase in rent that results in a vacant unit.

The program then outputs:

1. The number of units to be rented to maximize the profit
2. The maximum profit