Michelle's marbles generated $120,000 total sales for the month of september. Her total variable costs were just $56,000 ,leaving her with total contribution margin of $64,000.The selling price of marbles (a small bag is considered a unit) is $15.

How many units did Michelle sells that month?

Number of units sold units

What was her variable costs per unit?

Variable costs $ per unit

What was her contribution margin per unit?

Contribution Margin $ per unit