StarZinc Company produced 200 defective units last month at a unit manufacturing cost of $50. The defective units were discovered before leaving the plant. StarZinc can sell them as is for $35 or can rework them at a cost of $40 and sell them at the regular price of $100. The total relevant cost of reworking the defective units is:______.
a. $7,800.
b. $5,000.
c. $8,500.
d. $9,100.