Multiple Choice Question Suppose that when the price of gasoline is $3.50 per gallon, the total amount of gasoline purchased in the United States is 6 million barrels per day. Also suppose that when the price of gas decreases to $3 per gallon, the total amount of gasoline purchased is 8 million barrels per day. Based on these numbers and using the midpoint formula, the percentage change in the quantity demanded is: O 14.3%. O 32.9%. O 28.6%. O 12.33%