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During the past year, the company's financial results reflected the following: - Selling, general, and administrative expenses of 200,000 - Net sales of 1,200,000 - Interest expense of 100,000 - Research \& development expense of 50,000 - Cost of goods sold of 800,000 - Income tax expense of 17,500 a. Calculate gross profit $ for the year. b. Calculate gross profit % for the year. c. Calculate operating income $ for the year. d. Calculate net profit $ for the year