Purchase a call option with a strike price of 80 for 8.4 and a call option with a strike price of 100 for 1.9 and sell two call options with a strike price of 90 for 4.2 each. This portfolio makes money for a range of stock prices. What is the bottom end of the stock price range over which this portfolio makes money? This is the stock price below which you lose money and above which you make money. If there is no lower range, enter 0 for the lower range.