If gas costs S4 per gallon, how much will gas cost Sally per day just to get to and from Job A per day? per week? per year?

Answer 1

In addition to the distance from home to job, we also need to know the MPG the car gets.

Let D be the distance from home to job.

let MPG be the miles per gallon the car gets driving from home to job...

Then per day the total distance is 2D

So PER DAY , It will cost her $4(2D)/MPG = $8D/(MPG) that is multiply the distance by 8 and divide by the MPG.

Per week, it is 7 fold, so 56D/(MPG)

Per year, it is 365 fold, so 365*8*D/mpg = 2920*D / (mpg)