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Thriftco operates a chain of retail stores. The following data are for the stores of the Plains Division for the most recent year (in thousands of dollars). Farge Sioux Falls Omaha 1,200 1,500 Sales Cost of Goods Sold Gross Margin 1,300 228 572|| 576 297 Eupenses Occupancy Salaries/wages Advertising Miscellaneous Overhead 108 532 1 121 135 578 687 Segment margin _ 44 Average operating assets 1,000 950 1,100 (Depreciation, property tax, insurance, utilities) (50% local, 50% allocated corporate advertising) (general corporate overhead, allocated at 9% of sales) a) Recompute segment margin, using concepts learned in class. Use the recomputed numbers to answer the remaining questions. b) is the Sioux Falls store really losing money? Explain briefly. c) Compute ROI for each store. d) Compute residual income for each store, assuming that Thriftco's target ROI is 15%. e) Which is the top performing store? Identify the main reason for its superior performance