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Five years ago, Thomas Martin installed production machinery that had a first cost of exist25,000. At that time initial yearly costs were estimated at exist1250, increasing by exist500 each year. The market value of this machinery each year would be 90% of the previous year's value. There is a new machine available now that has a first cost of exist27, 900 and no yearly costs over its 5-year minimum cost life. If Thomas Martin uses an 8% before-tax MARR, hen, if at all should he replace the existing machinery with the new unit