BE4.4 - Using Excel to Determine Volume, Variable Cost, and Contribution Margin" Student Work Area Required: Provide input into cells shaded in yellow in this template. Input the required mathematical formulas or functions with cell references to the Problem area or work area as indicated. PROBLEM Mollys Marbles incurred variable and fixed costs in generating sales for the month of September. Marbles are sold in small bags with each bag consider to be one unit. Information concerning operations for the month of September follows. How many units did Molly sell that month? Total sales $50,000 Number of units sold Total contribution margin 30,000 Selling price per unit 5.00 What was her variable cost per unit? Variable cost per unit What is the contribution margin per unit? Contribution margin per unit