Sean and Bob are neighbors and are outside Sunday afternoon discussing their lawns and how hard it is to maintain the grass after a particularly rainy spring.Bob tells Sean he is upset because his mover broke and he is having to use a weed eater to cut all the grass.Sean tells Bob, "I have an extra mower I will sell you for $300 dollars, I planned to list it on craigslist on Friday for $400 so you have until then to decide".Bob says that he needs to talk to his wife and he will let Sean know by Friday.Sandy, their other neighbor, overheard the conversation and approaches Sean on Wednesday, offering him $350 for the mower.

Can Sean sell the mower to Sandy on Wednesday?