Can someone explain this to me? Handwriting is not allowed

In December 2007, a call option on Google stock with a June 2008 expiration and an exercise price of $720 sold for $80.50. If you bought this call, you gained the right to purchase Google shares for $720 at any time until the option expired in June. The price of Google in December was $720. If the stock price did not rise by June, the call would not be worth exercising, and you would lose your investment of $80.50. On the other hand, even a relatively modest rise in the stock price could give you a rich profit on your option. For example, if Google sold for $840 in June, the proceeds from exercising the call would be: