The North Carolina gas tax now is 38.5 cents a gallon. That increases to 40.5 cents a gallon come Jan. 1, due to a formula that takes population growth and inflation into account. The federal gas tax is an additional 18.4 cents a gallon. Jimmy Joe makes $100,000 a year and drives a Hummer. Karen Sue makes $50,000 a year and drives a Honda Accord. They both buy gas to fill up their cars. Based on this scenario you can infer that a gas tax is a _______ tax. Group of answer choices progressive flat proportional regressive