1. Now change all of the dollar amounts in the data area of your worksheet so that it looks like this: 1 Chapter 2: Applying Excel 3 Data 4 Sales 5 Variable costs 6 Cost of goods sold $21,000 $14,000 $1,400 1,200 Variable seling 8 Variable administrative 9 Fxed costs: Fxed seling 2,500 1,500 11 Foxed administrative If your formulas are correct, you should get the correct answers to the following questions. (a) What is the gross margin now? (b) What is the net operating income now? et operating (c) What is the contribution margin now? ntribution margin