Leia owns a robot repair shop. Luke walks into the shop with his robot, shows it to Leia, and asks if she can fix it. Leia tells Luke that she will fix the robot for $150. Luke says he will think about it and leaves, taking his robot with him. The next day, Luke walks back into Leia's shop. Without saying a word, he hands the robot to Leia and leaves. Leia repairs the robot and asks Luke to pay $150, but he refuses, claiming they did not form a contract.

This discussion board has two parts.

First, do Luke and Leia have an express contract, and implied contract, or no contract at all to repair the robot, and why?

Second, if they do have a contract, what consideration is each party offering?