Vitesse Semiconductor reported the following revenues and cost of goods sold for 2001-2003 (in thousands): 2002 2001 Revenues Cost of revenues 2003 $156,371 73,163 $151,738 110,155 $383,905 201,536 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 three years