In a 100-unit apartment building when the price charged per apartment rental is (820 + 40x) dollars, the number of apartments rented is 100- x and the total revenue for the building is R(x) = (820 + 40x) (100-x), where x is the number of $40 rent increases (and the resulting number of unrented apartments). Find the marginal revenue (in dollars) when x = 10. $ Does this tell you that the rent should be raised (causing more vacancies) or lowered? Explain. The rent should not be raised. An 11th rent increase would increase ✓revenue.

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