The following are sales, cost of sales, and inventory data for a company, a wholesale distributor of car accessories. Dollar amounts are in millions. (10 points)

	2015	2014	2013	2012
Sales	125	120	112	100
Cost of sales	110	95	90	80
Beginning inventory	16	15	13	11
Ending inventory	14	13	12	10

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Required

For each year, calculate the following ratios (1) Gross margin as a percentage of sales and (2) Inventory turnover