Mike owns a house in a poor area of a large city. mike is on disability and his total monthly income is $700. a sales representative visits his home, selling a water purification system. mike signs a contract that calls for monthly payments of $500 for the next 10 years. the water system is worth no more than $1000. mike thought he was signing a permission slip allowing the salesman to conduct a free water test to determine the toxins in the water. how would a court most likely describe this contract?