Suppose that the number of crates of an agricultural product is given by z= 11xy-0.0002x2-5y 0.03x + 4y where x is the number of hours of labor and y is the number of acres of the crop. Find the marginal productivity of the number of hours of labor (x) when x = 800 and y = 900. (Round your answer to two decimal places.) 2184.15 Xcrates Interpret your answer. If 900 acres are planted and 800 hours are worked, this is the number of crates produced. If 900 acres are planted, the expected change in the productivity for the 80134 hour of labor is this many crates. If 800 acres are planted, the expected change in the productivity for the 901 hour of labor is this many crates. If 800 acres are planted and 900 hours are worked, this is the number of crates produced.