问题如下图：
选项：
A. 
B. 
C. 
解释：
麻烦请讲解一下，谢谢
NO.PZ2016012101000233 问题如下 analyst gatherethe following ta for a company ($ millions):The average age anaverage preciable life of the company’s fixeassets the enof 2001 are closest to: Average AgeAverage preciable Life A.1.75 years7 years B.1.75 years14 years C.4.00 years7 years C is correct.The company ma no aitions to or letions from the fixeasset account ring the year, so preciation expense is equto the fferenin accumulatepreciation the beginning of the yeanthe enof the year, or $0.4 million. Average age is equto accumulatepreciation/preciation expense, or $1.6/$0.4 = 4 years. Average preciable life is equto enng gross investment/preciation expense = $2.8/$0.4 = 7 years. 上道题不是才说了算剩余年限是net PP E/累计折旧这个公式吗？
老师，31 c 2001 的gross investment in asset的数据为什么不是2.40，如果按照平均年限7年算？
还是不太懂这道题的原理
请问这道题是考哪个概念
