Selling, general, and administrative expenses were $132,000; net sales were $600,000; interest expense was $14,200; research and development expenses were $63,000; net cash provided by operating activities was $159,300; net income was $33,600; income tax expense was $15,200; cost of goods sold was $330,000.

Required:
a. Calculate operating income for the period.
b. Calculate net income for the period.