For example, in cell C18 enter the formula"-B6" After entering formulas in all of the cells that contained question marks, verify that the dollar amounts in both the traditional and contribution format Income statements match the numbers in Exhibit 1-7. Check your worksheet by changing the variable selling cost in the Data area to $900, keeping all of the other data the same as in Exhibit 1-7. If your worksheet is operating properly, the net operating income under the traditional format income statement and under the contribution format income statement should now be $700 and the contribution margin should now be $4,700. If you do not get these answers, find the errors in your worksheet and correct them. Chapter 1: Applying Excel Data Sales $12,000 Variable costs: Cost of goods sold $6,000 Variable selling $600 Variable administrative $400 Fixed costs: Fixed selling $2,500 Fixed administrative $1,500 Enter a formula into each of the cells marked with a ? below Exhibit 1-7 Traditional Format Income Statement Sales Cost of goods sold Gross margin Selling and administrative expenses: Selling Administrative Net operating income Contribution Format Income Statement Sales Variable expenses: Cost of goods sold ? ? ? ? ? ? ? Variable selling Variable administration Contribution margin Fixed expenses: Fixed selling Fixed administrative Net operating income ? ? ? ? ? 22