Question 237388
Just looking at the units:
(miles/year) / (miles/gallon) = (miles/year) x (gallons/mile) = gallons/year
given:
She drives {{{15000}}} miles/year
Her present car gets {{{30}}} miles/gallon
{{{15000/30 = 500}}} gallons/year
The car she wants gets {{{40}}} miles/gallon
{{{15000/40 = 375}}} gallons/year
and
Gas is ${{{1.65}}}/gallon for the year
For old car:
{{{500}}}gallons/year x {{{1.65}}} dollars/gallon = {{{825}}} dollars/year
For new car:
{{{375}}}gallons/year x {{{1.65}}} dollars/gallon = {{{618.75}}} dollars/year
{{{825 - 618.75 = 206.25}}}
In the 1st year, she'll save $206.25