Labour Output 40 100 220 JaUAWNEO 270 310 330 340 a. Construct a table showing marginal product and average product. b. At what units of labour does diminishing marginal returns set in? c. Given that the unit price of the output is $3, determine the value of marginal product and the value of average product. d. If the firm must pay a worker $120 per day, find how many workers it must hire to maximise profit