You Have Decided That You Want to Attend a Costume

Multiple Choice

You have decided that you want to attend a costume party as Iron Man. You estimate that it will cost $40 to assemble your costume. After spending $40 on the costume, you realize that the additional pieces you need will cost you $25 more. The marginal cost of completing the costume is

A) $15.
B) $25.
C) $40.
D) $65.