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Suppose that when the price of gasoline is $3 per gallon, the total amount of gasoline purchased in the united states is 8 million barrels per day. also suppose that when the price of gas decreases to $2.25 per gallon, the total amount of gasoline purchased is 12 million barrels per day. based on these numbers and using the midpoint formula, the percentage change in the quantity demanded is:

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Assuming  the total amount of gasoline purchased is 12 million barrels per day. The percentage change in the quantity demanded is: 50%.

Percentage change in the quantity demanded

Using this formula

Percentage change in quantity demanded= (Total amount of gasoline purchased- total amount of gasoline purchased in united states)/ Total amount of gasoline purchased in united statesĂ—100

Let plug in the formula

Percentage change in quantity demanded=(12 - 8) / 8

Percentage change in quantity demanded =4/8Ă—100

Percentage change in quantity demanded=50%

Inconclusion  the percentage change in the quantity demanded is: 50%.

Learn more about  percentage change in the quantity demanded here:https://brainly.com/question/25364127

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