The Scampini Supplies Company recently purchased a new delivery truck. The new truck has an after-tax cost of $23,500, and it is expected to generate after-tax cash flows of $7,250 per year. The truck has a 5-year expected life. The expected year-end abandonment values (after-tax salvage values) for the truck are given below. The compacy's Wacc is 11%. a. What is the truck's optimal economic life? Round your answer to the nearest whole number. year(s) b. Would the introduction of abandomment values, in adobion to operating cash fows, ever reduce the expected NPV and/or IRR of a project