2.- High Desert Campgrounds (HDC) rents spaces for recreational vehicles (RVS) by the day. HDC charges $15 per day for a space. The variable costs (including cleaning, maintenance, and supplies) are $7 per day. The fixed costs of HDC are $60,000 per year. HDC is subject to a tax rate of 35 percent on its income. If a "unit" is one space rented for one day, how many units docs HDC have to rent annually to earn $48,750 after taxes