Final answer:
Johan will likely lose the lawsuit because there was no bargained-for exchange.
Step-by-step explanation:
Johan will likely lose the lawsuit because there was no bargained-for exchange. In order for a contract to be enforceable, there must be a mutual exchange of promises or obligations between the parties involved. In this case, Johan washed Bill's car without being asked and without any prior agreement or expectation of payment. As a result, there was no bargained-for exchange between Johan and Bill, which is necessary for a valid contract.