(a) Is there a real significance to distinguish between offer and invitation to treat under contract law? (15 marks)

(b) Irene offers to sell her sewing machine to Mandy for $200. Mandy is a pensioner and is unwilling to pay $200. Mandy says she will pay $100. Irene refuses to accept this proposal. Mandy then decides to accept Irene's original offer of $200. Can Mandy accept the original offer? (10 marks)