A car gets 30 miles per gallon of gas and is driven 1000 miles per month. Gas costs $4 per gallon. How much will the car's owner save on gas expenses in one year by buying a new car that goes 50 miles for each gallon of gas?

1000/30 * $4 = A

1000/50 * $4 = B

Subtract B from A.

How to calculate how many gallons you get a mile.

To find out how much the car owner will save on gas expenses in one year, we need to calculate the current annual cost of gas and compare it to the future annual cost after buying the new car.

First, let's calculate the current annual cost of gas:
The car gets 30 miles per gallon and is driven 1000 miles per month, so it is driven 12,000 miles per year (1000 miles per month * 12 months).
To find out how many gallons of gas the car uses each year, we divide the total distance driven by the car's fuel efficiency: 12,000 miles / 30 miles per gallon = 400 gallons of gas.
Since each gallon of gas costs $4, the current annual cost of gas can be calculated by multiplying the number of gallons by the cost per gallon: 400 gallons * $4 per gallon = $1600.

Now let's calculate the future annual cost of gas with the new car:
The new car goes 50 miles for each gallon of gas.
With the same annual distance of 12,000 miles, the number of gallons of gas the new car will use can be calculated: 12,000 miles / 50 miles per gallon = 240 gallons of gas.
Using the same cost per gallon of $4, the future annual cost of gas for the new car can be calculated: 240 gallons * $4 per gallon = $960.

Finally, we can calculate the amount the owner will save on gas expenses in one year by subtracting the future annual cost from the current annual cost:
$1600 - $960 = $640.

Therefore, the car owner will save $640 on gas expenses in one year by buying a new car that goes 50 miles for each gallon of gas.