Typically, the sales volume declines with an increase of a product 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 cubic regression equation, predict the sales if the luxury good is priced at $100.
Definitions:
Return To Risk Ratio
A financial metric used to evaluate the potential return of an investment relative to its risk.
PHStat
An Excel add-in designed to perform statistical analysis.
Index Fund
A mutual fund or ETF aimed at mirroring the performance of a particular market index.
Day Trader
An individual who buys and sells securities within the same trading day, often taking advantage of small price moves.
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