Bill and his wife Martha went to the state fair every year and every year Bill would say, “Martha, I'd like to ride in that airplane.” Martha always replied, “I know Bill, but that airplane ride costs 10 dollars, and 10 dollars is 10 dollars.” One year Bill and Martha went to the fair and Bill said, Martha, I'm 81 years old. If I don't ride that airplane I might never get another chance.“ Martha replied, ”Bill, that airplane ride costs 10 dollars, and 10 dollars is 10 dollars.“ The pilot...