Use the Information Below to Answer the Following Question(s)

Use the information below to answer the following question(s) .
Akron Laser Wash sells deluxe car washes for $15 per customer. Variable costs are $9 per wash. Fixed costs are $40,000 per month.
-What is Akron Laser Wash's contribution margin per car wash?

A) $0.40
B) $9.00
C) $6.00
D) $2.50