Consider the following data for the WA & OR divisions of Northwest Co.: WA OR Sales $ 4,000,000 $ 2,000,000 Cost of Goods Sold 1,500,000 400,000 Operating Income 750,000 450,000 Investment in assets 6,250,000 2,500,000 The Northwest's required rate of return is 10%. Show your work to support the following calculations: a. Calculate the ROI for each division