21. Consider a project that costs $250 now and is expected to generate $98 in net revenues at the end of each of the next three years. If the MARR is 5%, the future worth of this project is...

23. Machine X has an initial cost of $12,000 and annual maintenance of $700 per year. It has a useful life of four years and no salvage value at the end of that time. Machine Y costs $22,000 initially and has no maintenance costs during the first year. Maintenance is $200 at the end of the second year and increases by $200 per year thereafter. Machine Y has a useful life of eight years and an anticipated salvage value of $5,000 at the end of its useful life. If the MARR is 6%, what is the approximate Net Present Worth (NPW) of machine X?