Question 3 Art and Betty own adjoining farms in County, an area, where all agriculture requires irrigation. Art bought a well-drilling rig and drilled a 400-foot well from which he drew drinking water. Betty needed no additional irrigation water, but in January 2011, she asked Art on what terms he would drill a well near her house to supply better tasting drinking water than the County water she has been using for years. Art said that because he had never before drilled a well for hire, he would charge Betty only $10 per foot, about $1 more than his expected cost. Art said that he would drill to a maximum depth of 600 feet, which is the deepest his rig could reach. Betty said, "OK, if you guarantee June 1 completion." Art agreed and asked for $3500 in advance, with any additional further payment or refund to be made on completion. Betty said, " OK," and paid Art $3500. Art started to drill on May 1. He had reached a depth of 200 feet on May 10 when his drill struck rock and broke, plugging the hole. The accident was unavoidable. It had cost Art $12 per foot to drill the 200 feet. Art said he would not charge Betty for drilling the useless hole, but he would have to start a new well close by, and could not promise its completion before July 1