13. An aircraft push truck costs $2,000,000 with an annual operating and maintenance (O&M) cost of $30,000. If the service life of the elevator is 20 years and minimum acceptable rate of return (i) is 10%, then its present worth (cost) will be: a. 2,030,000 b. 2,255,407 c. 2,445,200 d. 2,600,000

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6. A company is considering two alternatives for manufacturing a certain part. Method R will have a first cost of $40,000, and annual operating cost of $25,000, and a $10,000 salvage value after its five-year life. Method S will have an initial cost of $100,00, an annual operating cost of $15,000 and a $12,000 salvage value after its 10-year life. At an interest rate of 12% per yr, the present worth values of the alternatives are closest to;

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 __________.   A. $18.24   B. $19.54   C. $22.33   D. $18.29 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?     A. -$28,563   B. -$25,852   C. -$32,085   D. -$22,318