Walloon Company produced 200 defective units last month at a unit manufacturing cost of $30. The defective units were discovered before leaving the plant. Walloon can sell them as is for $20 or can rework them at a cost of $15 and sell them at the regular price of $50. The total relevant cost of reworking the defective units is $4,500. $6,750. $7,500. $3,000. $2,250