A proposed new \$5 coin is called the “foonie”. The foonie’s two faces are identical and each has area 5 \:cm^2. The thickness of the foonie is 0.5\:cm. How many foonies are in a stack that has a volume of 50\:cm^3?
Answer Choices
A. 5
B. 10
C. 15
D. 20
E. 40