A professor of economics at a small Texas university wanted to determine what year in school students were taking his tough economics course. Shown below is a pie chart of the results. What percentage of the class took the course prior to reaching their senior year? 
Definitions:
Underlying Asset
An asset or security on which a derivative instrument, such as a futures or options contract, is based.
Value Decrease
Occurs when the value of an asset or investment declines over time due to market conditions, wear and tear, or other factors.
Black-Scholes
A mathematical model used for pricing European-style options, taking into account factors like volatility, underlying asset price, strike price, and time to expiration.
American Style Puts
Options that give the holder the right to sell a specific stock at a specified price before the option expires.
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