Consider the following chart. What is the marginal product of labor (MPL) of the fifth worker? Land Total Product Labor (Workers) Marginal Product of Labor (MPL) (20 Acres) (Pounds) (2) (4) (1) (3) 20 acres 50 +50 20 acres -80 20 acres 130 220 -90 20 acres -80 20 acres 300 20 acres 370 20 acres 6 890 20 20 acres 380 10 -50 +40 -80 -70