I saw the sign below at my carwash last month and I always take the challenge when someone says, "Do the Math."

However, on this plaque, the "math ain't mathin'" so your challenge is to fix the math.
It reads,
618 cars / day
4,640 cars / week
18,560 cars / month
What numbers need to be changed?






            Send your solution by the end of the month to: David Pleacher