Please use the IRAC format to answer the following questions to determine whether a contract exists in each of these scenarios. Please refer to relevant legal principles and case-law in answering each of the questions.

(a) Daniel places the following advertisement in the local newspaper:

"Lost puppy. Labrador. Black colour. Last seen Old Eastern Road. $100 reward if found."

Gary, who has not read the advertisement, finds the puppy and returns it to Daniel. Subsequently Gary's sister sees the advertisement and shows it to Gary. Gary contacts Daniel asking for the $100.00. Is he legally entitled to it?

(b) Vincent enters a supermarket looking for some dinner. He approaches the deli area and picks up a hot chicken (from the Farmdale brand) resting in the warmer. He notices a price sticker on it of $10. Vincent proceeds to the checkout and puts the chicken down on the counter. At that moment, he hears a store announcement: "Lilydale chickens are going out for $5.00 customers, that's right $5.00! " Vincent tells the checkout operator that he wants a $5.00 Lilydale chicken and that he would put the Farmdale chicken he had back. The checkout operator says: "No, you can't do that. You've brought it this far, you have to have this one." At this point she has not swiped the bar code on the price tag. Advise Vincent as to whether he is legally entitled to the $5 chicken.

c) Paul decided to renovate his garage. He engaged David to do the work at an agreed price of $20,000.00 and completion date of 30 September. After the work had begun, Paul discovered that his extended family would be visiting in July. He promised to pay David another $3,000.00 if he could have the work completed by 10 July. David finished the work by 10 July but Paul refuses to pay the extra $3,000.00. Advise David.

d) Trudy promised her daughter Veronica that she would pay for her tuition fees in a well-renowned art school in France. Trudy now believes that Veronica is not responsible enough to live overseas on her own and refuses to pay for the fees. Can Veronica enforce her mother's promise?