Final answer:
The total contribution margin is $105,000.
Step-by-step explanation:
To calculate the total contribution margin, we need to subtract the variable cost per unit from the sales price per unit and then multiply by the number of units sold.
Total contribution margin = (Sales price per unit - Variable cost per unit) x Units sold
= ($7.50 - $2.25) x 20,000
= $5.25 x 20,000
= $105,000