we assume the operating and maintenance cost (including interest) is A in following 5 years. Model A costs $20,000, after 5 years is 50% , i.e. $10,000, she will spend20,000*(1+0.06)^5-10,000 +A=(16,764.51+A)Model B costs $18,000, after 5 years is 25% , i.e. $4,500, she will spend18,000*(1+0.06)^5-4,500+A=(19588.06+A...
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