What we are going to do for this case is find the cost for each case:
Cost to run the car before the mechanic worked on it:
\((4) * (8) = 32 dollars
(32) * (1/340) = 0.09 dollars / mile\)
Cost to run the car after the mechanic worked on it:
\((4) * (7) = 28 dollars
(28) * (1/350) = 0.08 dollars / mile\)
The difference between both cases is:
\(0.09 - 0.08 = 0.01 dollars / mile\)
Answer:
It cost to run the car after the mechanic worked on it 0.01 $ / mile less than before the mechanic worked on it.
