Question

You drive an average of 450 miles per week in a car that gets 22 miles per gallon. with gasoline priced at $3.50 per gallon on average, approximately how much would you save each year on gas if you instead had a car that got 40 miles per gallon?

Answer 1

First we have to compute how much we spend money each year.
Compute like this:

`(450)/(22)=20.45` is the number of gallons consumed each week.
In one year there is 48 weeks.
Then
`20.45*48=981.6` is the number of gallons a year.
Now compute the price:

`3.5*981.6=\$3435,6`
We do the same process with a car consuming 40 miles per gallon.
tex] \frac{450}{40}=11.25 [/tex] gallon consumed per week.

`11.25*48=540` gallons consumed per year.

`3.5*540=\$1890` is the amount paid each year in gallons.
So we are saving the following amount:

`\$3435,6-\$1890=\$1545`