Determine whether the sampling method described below appears to be sound or is flawed. In a survey of 799 subjects, each was asked how often he or she watched TV. The survey subjects were internet users who responded to a question that was posted on a news website.

Jody bought 20 shares of amazon at the close price of $121.00. she bought 20 more shares a year later at the price of $127.00. two years later, she sold all of her shares at the price of $133.00. her broker charges $50 for each transaction. after all of these transactions, how much money did jody make?