Just answer question 11 please with cases and sections.

7:131 Tute 4 I. What is a contract? Explain 2. What are contracts the law will not enforce? 3. What is a voidable contract as compared to a void contract? 4. What is the difference between a simple and a formal contract 5. What is an offer compared to an invitation to treat? 6, How are offers communicated? 7. How can an offer be made to the world at large? 8, What is a conditional offer? 9. What is an intention to create legal relations? When is there a presumption that no legal relationship was intended? 10. What is consideration and when is this not required? 11. Gary sees an advertisement in a newspaper for the sale of bicycle. Gary rings up the owner and asks for the price of the bike, he is told it is for sale at $150. Gary asks if the bike is in good condition, and is told that it is. Gary asks if he can come around and look at the bike and the buy it. Yes, says the seller, Gary then says will you accept S100, to which the seller replies, we will discuss this when you come around. Gary arrives and the bike has been sold. What rights does Gary have? 12. Fred enters a store and finds a good with a price tag of S10. When he goes to pay for this, he is told that that is the wrong price and he has to pay more. Can Fred enforce the contract 13. Ned offers to sell his cow for $100 to another farmer. The farmer replies 'will you accept S80? No, says Ned the farmer replies OK then I will pay you $100. Ned refuses to sell the cow. What are the rights of the other farmer