6. A small office cleaning service used marginal analysis to find their optimal # of floors to clean per week. Fill in the rest of the chart to see how many floors they should clean per week to maximize profits. Floors/week Cost Marginal Cost Floors/week Revenue Marginal Revenue 1 250 1 750 2 420 2 1050 3 560 3 1260 4 695 4 1450 S 5 1600 6 940 6 1720 7 7 1850 8 1230 8 1970 9 1405 9 2070 10 1590 10 2160 820 1080 a. What is their optimal # of floors to clean per week? b. What is their profit at the optimal number