Production: Marginal Interpret marginal product for a given situation. Consider the following chart. After which worker does the marginal product of labor (MPL) begin to decrease? Land (20 Acres) (1) Labor (Workers) (2) Total Product (Pounds) (3) Marginal Product of Labor (MPL) (4) 20 acres 0 0 - 20 acres 1 100 20 acres 2 220 20 acres 3 290 20 acres 4 350 20 acres 5 380 20 acres 6 400 20 acres 7 390 a.) After the third worker b.) After the sixth worker c.) After the first worker d.) After the second worker