Hello I'm in LAW 1101 at Baruch and I am confused about irrevocability in this question. The question is: On March 1, Irina wrote a signed letter to Benito and offered to sell the piano in her home to Benito for $400, and stated that she would keep her offer open for 4 months. On April 1, Irina sold the piano to Tonya, her cousin, for $500, without informing Benito that she did so. On June 10, Benito wrote Irina stating that he accepted her offer. Irinia immediately notified Benito that she could not sell the piano to because she had already sold it to Tonya. Benito sues Irina for breach of contract. Judgement for whom? Explain. Also does stating that she will keep the offer open for 4 months make it an irrevocable offer? Or does there need to be some consideration?