Our car has a 15 gallon gas tank. A lower grade or gasoline costs $2.96 per gallon. The premium grade gasoline costs $3.15 per gallon. There are three gallons left in your gas tank. What is the difference in the cost of filling your tank between the two grades of gasoline?

Answer 1

To fill the entire 15 gallon gas tank, we would need 12 more gallons of gasoline.

For lower grade gasoline:
12 gallons * $2.96/gallon = $35.52

For premium grade gasoline:
12 gallons * $3.15/gallon = $37.80

The difference in cost between filling the tank with lower grade and premium grade gasoline is:
$37.80 - $35.52 = $2.28.

Therefore, the cost of filling the tank with premium grade gasoline is $2.28 more expensive than filling it with lower grade gasoline.