Assume that gas mileage is proportional to the total energy released upon combustion of fuel. Use your results in question 2 (Ethanol=88,800 kJ/gal n-Octance=105,000 kJ/gal) to determine the ratio of ethanol /n-Octane required, in gallons to drive equal distances. How much should a gallon of ethanol cost relative to a gallon of n-Octane if the cost per mile driven is to be equivalent?

PLEASE HELP!!!

I would use a ratio

costpermileEthanaol/costpermileOct=105/88.8

remember, cost is inversley prop to cost..