Mini-Exercise 9-2 (Algo) Calculate operating income and net income LO 5 Selling, general, and administrative expenses were $74,000; net sales were $336,000; interest expense was $7,900; research and development expenses were $34,700; net cash provided by operating activities was $87,200; income tax expense was $8,400; cost of goods sold was $182,600. Required: a. Calculate operating income for the period. Operating expenses: b. Calculate net income for the period. Interest expense Income tax expense