一道英文数学题,If a $25,000 machine depresses $800 per year or 10%

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一道英文数学题,
If a $25,000 machine depresses $800 per year or 10% of its original value each year,find a function that expresses the machine's value v after t years have passed.If this machine has no salvage value,what is the useful life of this machine?

假如一台价值$25,000 的机器每年贬值 $800 或原价的10%,列出一个表达机器价值 v 在过了 t 年以后的函数.如果这台机器不存在补救价值,那么设台机器的寿命会有多久?
该题的答案是：
1.v=25000-800t
当 v=0,t=31.25时,
其结果是：31.25 年

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