The condensed income statements through income from operations for Dell Computer Corporation and Apple Computer Co. are reproduced below for recent fiscal years (numbers in millions of dollars).

Prepare comparative common-size statements, rounding to two digits after the whole percent. Interpret theanalyses.

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Dell Computer Corporation Apple Computer Co. Sales (net) Cost of sales Gross profit Selling, general, and administrative expenses Research and development Spcial charges Operating expenses Income from operations 31,168 25,661 5,507 $ 2,784 $5,363 4,128 $1,235 $1,138 452 482 430 3,718 S1,789 $1,579 (344)