The manager of a 90-unit apartment complex is trying to decide what rent to charge. Experience has shown that at a rent of $900 all of the units will be full. On average, one additional unit will be vacant for each $25 increase in rent. Answer parts (a) through (e) below. Question content area bottom Part 1 (a) Let x represent the number of $25 increases. Find an expression for the rent for each apartment. The rent for each apartment is given by enter your response here. Part 2 (b) Find an expression for the number of apartments rented. The number of apartments rented is given by enter your response here. Part 3 (c) Find an expression for the total revenue received from all rented apartments. R(x)equals enter your response here Part 4 (d) What value of x leads to maximum revenue? The maximum revenue will happen when xequals enter your response here. (Round to the nearest whole number as needed.) Part 5 (e) What is the maximum revenue? The maximum revenue is $ enter your response here. (Round to the nearest whole number as needed.)