$ 40 per unit 4. [0/4 Points] DETAILS PREVIOUS ANSWERS LARAPCALC10 3.5.020.MI. MY NOTES ASK YOUR TEACHER A real estate office handles a 80-unit apartment complex. When the rent is $520 per month, all units are occupied. For each $30 increase in rent, however, an average of one unit becomes vacant. Each occupied unit requires an average of $45 per month for service and repairs. What rent should be charged to obtain a maximum profit? $ X Viewing Saved Work Revert to Last Response