Marigold Corp.can produce 100 units of a component part with the following costs:
Direct Materials $21000
Direct Labor 5500
Variable Overhead 19000
Fixed Overhead 11000
If Marigold Corp. can purchase the units externally for $50000, by what amount will its total costs change?

A. An increase of S4500
B. An increase of $50000
C. An increase of $15S00
D. A decrease of $11000