Save Submit Selling, general, and administrative expenses were $76,000; net sales were $345.000; interest expense was $8,100; research and development expenses were $35,500; net cash provided by operating activities was $89.200, income tax expense was $8,600: cost of goods sold was $187.000, Required: a. Calculate operating income for the period. $ 345,000 (187,000) 158,000 Net sales Cost of goods sold Gross profit Operating expenses: Selling, general and administrative expenses Research and development expenses Operating income (76,000) (35,500) b. Calculate net income for the period. b. Calculate net income for the period. Interest expense Income tax expense