Answer:
$475
Step-by-step explanation:
1 Unit = $800, and 50 Units = $800 × 50 = $40,000. Maintenance cost = $50×50 = $2500. Apartment gross income = $40,000-$2,500= $37,500. Increment = $800 + 25 = $825, After increment, one fewer apartment was rented meaning, (50-1) apartment = 49 apartment was rented. After the increment, 49 × 825 = $40,425. Maintenance cost= 49×$50=$2450. After increment, the gross income will be $40,425-$2450= $37,975. Now, the rent that maximises the total amount of rent is the gross income for the new rent - the gross income for the old rent = $37975 - $37,500 = $475.