Following is Stanley's income statement for the year (in millions): STANLEY INC. Income Statement For the year ended December 31 ($ millions) Sales $11,406.9 Cost of goods sold 7,068.3 Gross profit 4,338.6 Selling, general and administrative expenses 2,576.0 Other operating expenses 265.5 Operating income 1,497.1 Interest and other nonoperating expenses 169.6 Income before income tax 1,327.5 Income tax expense Net income 258.6 $1,068.9 Compute Stanley's gross profit margin. Select one: a. 38.0% b. 62.0% O c. 13.1% d. 9.4% O e. None of the above Acti Go to