A retrofitted space-heating system is being considered for a small office building. The system can be purchased and installed for $125,000, and it will save an estimated 250,000 kilowatt-hours (kWh) of electric power each year over a five-year period. A kilowatt-hour of electricity costs $0.09, and the company uses a MARR of 15% per year in its economic evaluations of refurbished systems. The market value of the system will be $7,000 at the end of five years, and additional annual operating and maintenance expenses are negligible. Required:
Use the benefit-cost method to make a recommendation.

Amachine purchased three years ago for $720,000 has a current book value using straight-line depreciation of $400,000: its operating expenses are $60,000 per year. a replacement machine would cost $480,000, have a useful life of nine years, and would require $26,000 per year in operating expenses. it has an expected salvage value of $130,000 after nine years. the current disposal value of the old machine is $170,000: if it is kept 9 more years, its residual value would be $20,000. calculate the total costs in keeping the old machine and purchase a new machine. should the old machine be replaced?

Afreelance​ singer-songwriter is planning the restoration of a recently purchased civil​ war-era farmhouse. while he professes an enjoyment​ of, and talent in the construction​ trades, the theory of comparative advantage implies that a. the value of what he imports​ (in this​ case, professional contractor​ services) must equal the value of what he exports​ (songs). b. he should concentrate on the restoration work since his​ out-of-pocket costs will be much lower than if he hires professionals. c. ​self-sufficiency is​ advantageous, hence he should split his time between music and construction. d. the income lost while away from music will likely exceed the savings realized by doing the work​ himself, thus, he should hire professionals to do the restoration work. e. he ought to do as much of the work himself as possible since imports​ (in this​ case, professional contractor​ services) should always be restricted to those things that cannot be done internall

Ok, so, theoretical question: if i bought the mona lisa legally, would anyone be able to stop me from eating it? why or why not?