Sam supplies gelato for Daisy's business. On Monday, Daisy orders 40kg of gelato to be delivered on

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Question:

Sam supplies gelato for Daisy's business.

On Monday, Daisy orders 40kg of gelato to be delivered on Friday. Sam replies, "I can do that for $100". Daisy says "Okay, great, I'll transfer the money now". Daisy transfers $100.

On Tuesday Sam tells Daisy that he only has 30kg of gelato in stock. Daisy says "that is disappointing, can you deliver it on Thursday instead, and refund $25?". Sam agrees and refunds Daisy $25.

On Thursday Sam delivers 15kg of gelato to Daisy.

On Friday Daisy demands that Sam deliver 5kg of gelato for free. Advise Sam:

whether there is a valid contract(s)

what the terms of that contract or contracts are; and

whether Sam has any outstanding contractual obligations to Daisy.