In July, The Green sprayed 620 yards using 8 workers. In August, Tru Green sprayed 580 yards using S workers. The workers work 200 hours per month. The average revenue per yard sprayed was $130. Each employee makes $12 per hour. The cost of chemicals to spray the yard is $30. The cost of the equipment is $40 per yard. A) Calculate the labor productivity for both months in terms of yards per person. B) Calculate the multifactor productivity for both months using yard revenue as your output and labor, chemical cost and equipment cost as your inputs. C) Calculate the percentage change in the labor productivity from July to August