$84,000. Net Income (NI) is the residual or remainder amount of income after all expenses. Here, the company has revenues of $400,000 and cost of goods sold (COGS) of $280,000 for a gross income of $120,000 (the difference between revenues and COGS). The only selling expense is the tax of 30 percent on the income, so we subtract 30 percent of the gross income, or $36,000, from the gross income to get $84,000 for the Net Income.