a. In 2015, Smileytown consumed 12,000 gallons of mouthwash. In 2016, mouthwash consumption rose to 17,000 gallons. Calculate the percentage change in mouthwash consumption. b. If the price of gasoline was $3.25 a gallon and it is now $3.75 a gallon, what is the percentage change in price? c. At a recent company meeting, Ravi Batra, sales manager of Life's a Beach, a surfboard producer announced, "We have increased our sales by 13 percent in just 9 months." Suppose 9 months ago, its sales amounted to $245,000, what is the value of its sales today?