dentifying Operating Income Components Following is the income statement information from Apollo Medical Devices. Identit $ thousands 2020 Net sales $4,163,770 Cost of sales before special charges 1,382,235 Operating Special inventory obsolescence charge 27,876 Non-operating Total cost of sales 1,410,111 Gross profit 2,753,659 Selling, general and administrative expense 1,570,667 Research and development expense 531,086 Merger and acquisition costs 46,914 In-process research and development charges 12,244 Litigation settlement 16,500 Operating profit 576,248 Interest expense (57,372) Interest income 2,076 Gain on disposal of fixed assets 4,929 Impairment of marketable securities (5,222) Other income (expense), net (2,857) 4 Earnings before income taxes 517,802 Income tax expense 191,587 Net earnings $326,215 Check