Supply the missing dollar amounts for the current year income statement of NexTech Company for each of the following independent cases. how are they calculated or are there formulas to determined the answers??

Case A Case B Case C Case D Case E Sales revenue 930 850 510 Cost of goods sold 350 630 480 Gross margin Selling expense Administrative expense 455 380 110 95 370 210 140 90 120 75 Pretax income 215 230 190 Income tax expense 35 30 55 30 Net income 130 60 65 24