Arthur offers to sell his boat for $5000 to Norman by letter that arrives at Norman's office. Norman goes home and thinks about it overnight. In the morning he decides to get the money ready. He is just about to ring Arthur when Ted comes to the door and tells Norman,

"I saw Arthur last night at the Pub and he told me to tell you he longer wishes to sell his boat".

a)Was the communication by Ted effective revocation of the offer?

b)What if Norman had accepted the offer via a letter that he had posted before Ted arrived?

c)If Arthur says he was drunk at the time he made the offer and Norman accepts can Arthur avoid the contract?