Preston bought gasoline for his truck four times last month. He bought 74 litres at $1.25 per

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Preston bought gasoline for his truck four times last month. He bought 74 litres at $1.25 per litre, 45 litres at $1.32 per litre, 88 litres at $1.28 per litre, and 20 litres at $1.39 per litre.

a. What simple average price per litre did Preston pay for gasoline last month?

b. What weighted average price per litre did Preston pay for gasoline last month? Round to the cent..

c. Which averaging method is the better reflection of Preston's gasoline cost last month? Why?

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