7. The table below shows how the number of university classrooms cleaned in an evening varies with the number of janitors: Janitors per evening 6 7 Classrooms cleaned per evening 17 16 Marginal Product = Slope Marginal Cost Variable Cost Average Variable Cost You can fill in the Marginal Products from the information given. a. What is the marginal product of the second janitor? b. What is the average product of four janitors? C. Is the addition of the third janitor associated with increasing, diminishing, or negative marginal returns? d. Is the addition of the fourth janitor associated with increasing, diminishing, or negative marginal returns? e. Is the addition of the seventh janitor associated with increasing, diminishing, or negative marginal returns? f. Calculate the slope of the total product curve as each janitor is added. To convert this information on the productivity per work to costs per unit, a. If each janitor costs $100/day, what is the marginal cost per classroom cleaned? (note: this doesn't work for 6 or 7 janitors, because in this textbook example, it isn't possible to clean more than 17 classrooms per evening) b. What is the variable cost (in total) associated with the number of janitors hired? c. What is the average variable cost per classroom cleaned? Helpful Formulas: Average X = X/ Q Example: AVC = VC / Q. Marginal Cost = change in Cost / change in