On Friday, Bill Gates gave the active investment manager of his charity, Tina, a notice of dismissal. With risk-free short-term interest rates at 5%, Tina decided to use $30 million of the charity's holdings to purchase four-year rights to re-runs of the television show "Corner Gas". First year sales revenue from the show was $8 million. Tina, the manager who was fired over the incident, was quoted as saying "I'm being fired for no reason. I projected annual sales of $8 million per year for four years. My sales forecasts were right on target and we should make a two million dollar profit." Assuming that Tina's forecasts will be realized, explain to her why she was fired? Show all your work