Question

Ali owns a truck that gets approximately 25 miles per gallon. If

Ali drives 25,000 miles in a year and the average cost of a gallon
of gasoline is $3.50, what is Ali's approximate annual gasoline
cost

Answer 1

$35,000/year

Explanation:

See the attached table. Start by entering the data in a table, with units. We want an answer that is $/year, the total cost of gasoline for the year. We have the price per gallon, but we need the total number of gallons.

Note that we have two known values: 25 m/g (miles/gallon) and 25,000 m/y (miles/year).

The units are m/g and m/y. If we divide m/y by m/g we get the following unit: (m/y)/(m/g) = (g/y) or gallons per year. [The miles cancel and the gallons moves to the top].

Therefore: (25,000 m/y)/(25 m/g) = 1,000 gallons/year

Then: (1,000 gallons/year)*(1 year)*($3.50/gal) = $35,000/year