A group of enterprising engineering students has developed a process for extracting combustible methane gas from cow manure (don't worry, the exhaust is odorless).With a specially adapted internal combustion engine, the students claim that an automobile can be propelled miles per day from the "cow gas" produced by a single cow. Their experimental car can travel miles per day for an estimated cost of $ (this is the allocated cost of the methane process equipment, the cow manure is essentially free). Assume that there are 365 days in a year. a. How many cows would it take to fuel miles of annual driving by a fleet of cars? What is the annual cost? b. How does your answer to Part (a) compare to a gasoline-fueled car averaging miles per gallon when the cost of gasoline is $ per gallon?