Answer:
 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:
Â
 Cost to run the car after the mechanic worked on it:
Â
 The difference between both cases is:
Â
 Answer:
 It cost to run the car after the mechanic worked on it 0.01 $ / mile less than before the mechanic worked on it.
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