Final answer:
Whether Sandy can revoke depends on the contract terms and whether acceptance and consideration have occurred. No revocation is typically allowed after a binding agreement is in place. The situation would be resolved based on the principles of contract law.
Step-by-step explanation:
The question relates to the concept of revocation in contract law. If you ordered paint but have not started painting the house, the ability of Sandy to revoke depends on the terms of the contract between you and Sandy. If Sandy is the seller and there is a binding contract, then she generally cannot revoke the offer for sale if you have already accepted it by placing an order, unless the contract specifies otherwise or there are contingencies within the contract that allow for revocation before performance has begun or before a specific event occurs.
It is worth noting that if you have paid for the paint or provided some form of consideration, this often solidifies the contract, making it more difficult for either party to unilaterally revoke the agreement. In scenarios where specific terms were not discussed, general principles of contract law, such as offer and acceptance, consideration, and the rights and obligations of the parties, would apply to determine each party's right to revoke.