Vitesse Semiconductor reported the following revenues and cost of goods sold for 2001-2003 (in thousands):

Calculate the gross margin ratio (gross margin/sales) for each year. In 2001 the firm took a charge for obsolete inventory of $46.5 million and, in 2002, another $30.5 million. Explain how these charges affect the gross margin ratio in each of the threeyears.

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2003 2002 2001 Revenues Cost of revenues 156,37 $151,738 383,905 110.155 73,163 201,536