Donna, a 16 year old girl, entered into negotiations to purchase a hunting cabin in the mountains from Josh.  Neither party was represented by an attorney during the negotiations.  Josh’s asking price for the cabin was $60,000.  Donna’s first offer for the cabin was an extreme “lowball offer” of $5,000, which she really intended as a way to get the negotiations started.  Eventually, they agreed on a purchase price of $50,000 and shook hands on the deal.  The negotiations were witnessed by various third parties, all of whom stated that the agreed upon price was $50,000.  John had a friend of his type up a simple contract memorializing the deal.  However, the friend made a typographic error  and stated that the purchase price was $5,000.  Josh and Donna both signed the contract.  At the closing, Donna tendered $5,000 and demanded the deed in accordance with the written contract.
 
 
 
 
Question: Must Josh sell the cabin for $5,000?  Why or why not?