[問題]請高手幫忙！！！跟殘值相關
抱歉
我本身完全沒有學過這方面的學科
麻煩大家幫忙！！
題目：
Tai-power Co. is considering two different materials for use in electricity
generation. Thecosts are shown below. Use present worth to decide
which material should be selected, at an interestrate of 10% per year.
Material JX Material KZ
First cost, $ -205,000 -235,000
Maintenance cost, $/year -29,000 -27,000
Salvage value, $ 2,000 20,000
Life, years 2 4
我的問題：
用最小公倍數來求「殘值」究竟要不要重複計算？在哪裡計算？
兩種材料成本計算是這樣嗎？（數值暫且除以一千）
Year JX KZ
0 -205 -235
1 -29 -27
2 -205-29＋2 -27
3 -29 -27
4 -29 -27+20
真的拜託大家，我已經查了兩個鐘頭了.....感謝！
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