Selling, general, and administrative expenses were $62,000; net sales were $281,600; interest expense was $6,600; research and development expenses were $29,000; net cash provided by operating activities was $72,900; income tax expense was $7,000; cost of goods sold was $152,100. Required: a. Calculate operating income for the period. Operating expenses: b. Calculate net income for the period. Interest expense Income tax expense