Marlborough Corporation has provided the following for three months of income statements:

J alularj.r February March Sales in Units 3 ,000 3,500 4,000 Sales 3 00,000 350,000 400,000 Less: cost of goods sold 120,000 140,000 160,000 Gross margin 180,000 210,000 240,000 Operating expenses: Advertising 10,000 Salaries 5 Commissions 100,000 Depreciation expense Utilities expense 12,000 19,500 25,000 22,000 Total operating expenses 142,000 149,500 157,000 Net Income 38,000 60,500 83,000