16) Using account analysis, what type of cost is an electric bill that charges a flat monthly fee plus a charge for each kilowatt hour of electricity used? 16) A) Mixed B) Variable C) Step D) Fixed 17) Using account analysis, what type of cost is the price of gasoline when your car gets 30 miles per gallon and each gallon costs $3.657 17) A) Mixed B) Step C) Fixed D) Variable