Problem No. 3 For the cash flows shown, use an annual worth comparison and an interest rate of 10% per year. (a) Determine the alternative that is economi- cally best. Determine the first cost required for each of the two alternatives not selected in (a) so that all alternatives are equally acceptable. Use a spreadsheet to answer this question. (using Excel) (b) First cost, $ Annual cost 90,000-400,000 -650,000 40,000 -20,000 -13,000 80,000 Salvage value, $ 7,000 25,000 200,000 per year Overhaul every 10 years, $ Life, years 10