Thursday Aftemoon sells housewares through two distribution channels - retail stores and Internet. Each distribution channel is evaluated as an investment center. Selected results from the latest year are as follows: Retail Internet Sales $12,000,000 $2,750,000 Net Operating Income 480,000 220,000 Average operating assets 6,000,000 2,000,000 Required rate of return 12% 12% Required: (4 points) a. Calculate the profit margin, investment turnover and ROI for each of store. b. Calculate the residual income of each store