Answer:
It cost 1.41 cents per mile less to run the car after the mechanic worked on it.
Step-by-step explanation:
Given that 1 gallon is $4, and
Initially,
8 gallons = 340 miles = $32 = 3200 cents
Then
7 gallons = 350 miles = $28 = 2800 cents
Initial rate in cent per mile is:
3200/340 = 9.41
Final rate in cent per mile is:
2800/350 = 8
The difference is: 9.41 - 8 = 1.41 cents