Vicki is contractually obligated to sell the condo to Sally; she breaches that obligation when she sells to the condo to Roger; hence, it would seem that she is liable for breach of contract. However, this is not true if Sally's refusal to pay on June 1 is a material breach, which would excuse Vicki's contractual obligation to sell the property to Sally.

Vicki is contractually obligated to sell the condo to Sally; she breaches that obligation when she sells to the condo to Roger; hence, she is liable for breach of contract.