I need help solving the question marks. I don't know the formulas to use.

Chapter 1: Applying Excel $12,000 Data Sales Variable costs: Cost of goods sold Variable selling Variable administrative Fixed costs: Fixed selling Fixed administrative $6,000 $600 $400 $2,500 $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