Concord Corporation can produce 100 units of a component part with the following costs: Direct Materials Direct Labor Variable Overhead Fixed Overhead $21000 5500 19000 11000 If Concord Corporation can purchase the units externally for $50000, by what amount will its total costs change? O An increase of S4500 O An increase of $50000 O An increase of $15S00 O A decrease of $11000