In nine months, 55.6 gallons were used. find the unit rate (1 point)
A. 0.618 gallons/ month
B. 9.27 gallons/ month
C. 12.36 gallons/ month
D.6.18 gallons month
To find the unit rate, we divide the total amount used in nine months (55.6 gallons) by the number of months (9):
55.6 gallons รท 9 months = 6.18 gallons/ month
Therefore, the unit rate is 6.18 gallons/month.
The correct answer is option D.