Anne found a cow-hide leather backpack on Instagram which she thought would be perfect for school. She contacted the seller, Jumbo Enterprise to ask for the price and details of the backpack. Jumbo Enterprise told her that the backpack was on sale and Anne shall get 10% discount from the selling price. Anne was satisfied with the price but found that the size was a bit small for her. She has registered six subjects next semester and needed a bigger backpack. Anne refused to buy. Jumbo Enterprise insisted Anne to proceed to make payment and claimed there was already a contract between them.

Anne believes that there is no contract with Jumbo Enterprise as what she did was just asking for the price and details of the backpack.

In the light of the above situation, discuss the differences between offer and invitation to treat and advise Anne accordingly.