Selling, general, and administrative expenses were $68,000; net sales were $309,000; interest expense was $7,300; research and development expenses were $32,300; net cash provided by operating activities was $81,200; income tax expense was $7,800; cost of goods sold was $169,400. Required: a. Calculate operating income for the period. 0 Operating expenses: b. Calculate net income for the period. Interest expense 0 Income tax expense