A presently owned machine can last for three more years, if properly maintained at a cost of $15,000 per year. Its operating cost will be $31,000 per year. After three years, it can be sold for an estimated $9000. A replacement costs $80,000 with a $10,000 salvage value after three years and an operating cost of $19,000 per year. Different vendors have offered $10,000 and $20,000, respectively, for the current system in trade for the replacement. At 12% per year interest, perform a replacement study for the two trade-in offers.

b. a single paragraph.

a paragraph is a series of sentences that are organized and make sense, and are all related to a single topic . almost every piece of writing you do that is longer than a few sentences should be organized into paragraphs. this is because paragraphs show a reader where the subdivisions of an essay begin and end, and thus the reader see the organization of the essay into subjects in order to be able to understand its main points.

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.