X contracted with Z. X promised to pay $500; Z promised to build a cabinet to hold X's DVDs. The essential terms included the type and quality of the wood, the dimensions, and the date of completion, February 13, 2011. The work went more easily than expected and Z said to X. "If you pay me another $85, I will have this finished and be out of here by February 10.X agreed. If the cabinet was done to specifications by the 10th, but X refused to pay anything. Z would be entitled in law to O nothing. $500. $585. only $85. a "fair price