Please answer, big help, thanks.. use days sales inventory=(inventory/cost of sales) x 365

Compute its gross margin and gross margin ratio for the 2011 fiscal year. Comment on your computations-assume an industry average of 40% for the gross margin ratio. Compute its inventory turnover and days' sales in inventory for the year ended September 24, 2011 Comment on your computations-assume an industry average of 40 for inventory turnover and 9 for days' sales in inventory