Typically, the sales volume declines with an increase of a product's price. It has been observed, however, that for some luxury goods the sales volume may increase when the price increases. The following scatterplot illustrates this rather unusual relationship. 
Using the quadratic equation, predict the sales if the luxury good is priced at $100.
Definitions:
Parathyroid Hormone
A hormone produced by the parathyroid glands that regulates calcium levels in the blood and bone metabolism.
Anabolic Steroids
Synthetic substances similar to the male sex hormone testosterone, used to increase muscle mass and strength.
HDL Concentration
The amount of high-density lipoprotein, often referred to as "good" cholesterol, present in the bloodstream.
Cardiovascular Disease
A class of diseases that involve the heart or blood vessels, including coronary artery disease, hypertension, heart failure, and stroke.
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