Answer:
4320$
Step-by-step explanation:
840 : 7(days of week)=120$
120 × 36(days) =4320
$ 4320
a week = 7 days
$840 .......... 7 days
$ x .............36 days
x = 840*36/7 = 120*36 = $ 4320
you will save 10 gallons
120
