Why is there a 9/10 of a cent on the price of a gallon of gasoline.?

Question

Why dont they make it an even cent.

Answer 1

politicians use this method to fool the public so they can calm down .when you see sign with this decimal, it is just an illusion to make it look low .another example is if you takes 1/4 of the a penny such as sales tax, and multiply by billions,you get a big fat paycheck.

Answer 2

it goes back to when the states charged a 9/10 cent tax on a gallon of gas