Elizabeth's Marbles generated $92,000 in total sales for the month of September. Her total variable costs were just $23,000, leaving her with total contribution margin of $69,000. The selling price per unit of marbles (a small bag is considered a unit) is $8. How many units did Elizabeth sell that month? Number of units sold What was her variable cost per unit? Variable costs $ What was her contribution margin per unit? Contribution margin $ units per unit per unit