I need help filling in this Income statement out but most importantly I need to understand how to fill everything in. I would like an explanation, not just answers.

Year 1 Year 2 Year 3 Year 4 Sales Cost of goods sold Gross margin Operating expenses Operating income (EBIT) Interest expense Earnings before taxes (EBT) Corporate taxes (40%) Net Income 12,011 14,000 3,011 2,992 8,976 5,200 9,100 7,000 3,650 6,201 2,799 1,679 1,007 2,547 945 800 1,050 1,440