If p units of an item are sold for q dollars per unit, the revenue is upper r equals pq r=pq. use this idea to analyze the following problem, working exercises 57 dash –60 in order. the manager of an 100 100-unit apartment complex knows from experience that at a rent of $300, all the units will be full. on the average, one additional unit will remain vacant for each $20 increase in rent over $300. furthermore, the manager must keep at least 45 45 units rented due to other financial considerations. currently, the revenue from the complex is $ 60 comma 000 60,000. how many apartments are rented? 57. suppose that x represents the number of $20 increases over $300. represent the number of apartment units that will be rented in terms of x. nothing (simplify your answer.)