4) What will an $8,000 car cost 5 years from now if the inflation rate over that period averages 5%. 5) At today's rate, a gallon of gas costs $2.59, if the inflation rate over the next 8 years is 7%, how much will a gallon of gas cost? 6) A company estimates that it will need $100,000 in 8 years to replace a computer. If it establishes a sinking fund by making fixed monthly payments into an account paying 7.5% compounded monthly, how much should each payment be