Selling, general, and administrative expenses were $195,800; net sales were $890,000; interest expense was $21,400; research and development expenses were $93,450; net cash provided by operating activities was $236,300; income tax expense was $19,920; cost of goods sold was $489,500. Required: a. Calculate operating income for the period. 0 Operating expenses: b. Calculate net income for the period. Interest expense 0 Income tax expense