Crunchy Fruits Makes Dried Fruit Snacks

Crunchy Fruits makes dried fruit snacks. Crunchy Fruits has a multi- plant firm with two production facilities. The table abo summarizes the marginal cost of production at the individual plants and the corresponding quantity produced at the individual plants.
-Refer to the table above. What is Crunchy Fruits total marginal cost to produce 15,000 units?

A) $3.75
B) $3.25
C) $4.50
D) $2.25