Payback Period and NPV of a Cost Reduction Proposal-Differential Analysis (a) Determine the payback period of the incremental investment if gasoline costs $3.50 per gallon. years value of money. (Use a negative sign with your answer.) $x (c) Determine the cost of gasoline required for a payback period of three years. $ per gallon (d) At \$3.50 per gallon, determine the VUE Green combined gas mileage required for a payback period of three years. K miles per gallon Ranking Investment Proposals: Payback Period, Accounting Rate of Return, and Net Present Value Presented is information pertaining to the cash flows of three mutually exclusive investment proposals