Answer: EDIT: I read the comments if there are 6.6 gallons and the total was $20.39
you divide 6.6 by 20.39 first to find what it cost per gallon...
then you multiply 3.09 by 0.06 which is the percent!
then you subtract 0.18 from the original price per gallon which was 3.09.
so the new price with the 6% decrease is 2.91 per gallon
so if he was to get 6.6 gallons again with the new price it would be...
Step-by-step explanation:
Ok, so i dont know the original price but hope this explanation helps!
So example: If the original price was 5.00$ per gallon you make the percent a decimal first by doing that you wove the decimal point to places to the left so 6% would be 0.06 as a decimal.
afterwards, you multiply the original amount from the percent decimal!
then you subtract that from the original price!
then this is your answer!
and you can do this with any number...