E21-32 Computing contribution margin in total, per unit, and ratio Complete the table below for contribution margin per unit, total contribution margin, and contribution margin ratio:

A B C Number of units 1,300 units 3,600 units 7,500 units Sales price per unit $ 100 $ 40 $ 125 Variable costs per unit 40 10 100 Calculate:

Contribution margin per unit Total contribution margin Contribution margin ratio