If Joel Buys Ten Floppy Disks, Which Are Worth a Total

question 71

Multiple Choice

If Joel buys ten floppy disks, which are worth a total of $30 to him, and he pays $1 a disk, how much consumer surplus does he derive?

• A)$24
• B)$15
• C)$20
• D)$10
• E)$2 from each floppy disk

---

Definitions:

Xerophthalmia

A medical condition characterized by dry eyes due to a lack of vitamin A, which can lead to vision problems.

Orthoptics

A branch of ophthalmology dealing with the diagnosis and treatment of defective vision and the management of eye movement disorders.

Lens

A piece of glass or other transparent material with curved sides for concentrating or dispersing light rays, used in glasses and cameras.

Rhodopsin

A pigment found in the rods of the retina that is responsible for the first step in the perception of light.