# What's the future price when you exercise the future option

Here is the example of future option in John Holl's book Options, Futures and Other Derivatives 9th page 384.

I don't understand that when you exercise the future call option, you enter a long position of a future, then what's the price of your future? Actually, I don't much understand the P&L on future when you close out the future after exercise.

For my understand, you hold a long position of future with price $331,$ when you exercise, the price become $330,$ then you should lose the money $$25000\times(331-330)$$ but not earn the money in the book, so where is my misunderstand?