Answer: EDIT: I read the comments if there are 6.6 gallons and the total was $20.39
you divide 6.6 by 20.39 first to find what it cost per gallon...
[tex]20.39/6.6=3.09[/tex] then you multiply 3.09 by 0.06 which is the percent!
[tex]3.09*0.06=0.18[/tex] then you subtract 0.18 from the original price per gallon which was 3.09.
[tex]3.09-0.18= 2.91[/tex] so the new price with the 6% decrease is 2.91 per gallon
so if he was to get 6.6 gallons again with the new price it would be...
[tex]2.91*6.6=19.21[/tex]
Step-by-step explanation:
Ok, so i dont know the original price but hope this explanation helps!
So example: If the original price was 5.00$ 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!
[tex]5*0.06=0.3[/tex] then you subtract that from the original price!
[tex]5-0.3=4.70[/tex] then this is your answer!
and you can do this with any number...
