3. Pam's Pretzels has a production function shown in the following table. It costs Pam's Pretzels $80 per day per worker. Each pretzel sells for $3. Quantity of labor Quantity of pretzels 0 0 1 100 2 180 3 240 4 280 5 320 6 340 7 340 8 320 a. Compute the marginal product and the value of the marginal product that each worker creates. b. How many workers should Pam's Pretzels hire?