At the beginning of March, Company X had a finished goods inventory of $50,000. The cost of goods manufactured during the month was $30,000. At the end of the month, the finished goods inventory was $60,000. The total sales for the month was $180,000 and the total selling and administrative expenses were $10,000. Assume that there was no underapplied or overapplied manufacturing overhead by the end of the month, calculate the net operating income for the month of March ($). O a. None of the given answers O b. 150,000 Oc. 90,000 O d. 80,000 100.000 e