In a 100-unit apartment building when the price charged per apartment rental is (860 + 20x) dollars, the number of apartments rented is 100 - x and the total revenue for the building is R(x) = (860 + 20x)(100 - x), where x is the number of $20 rent increases (and the resulting number of unrented apartments). Find the marginal revenue (in dollars) when x = 10. $ X Does this tell you that the rent should be raised (causing more vacancies) or lowered? Explain. The rent should ---Select--- v . An 11th rent increase would ---Select--- | revenue. Need Help? Read It