问题如下：
When someone wants to figure out the remaining useful life of a firm’s assets, which of the following condition is the most accurate one?
选项：
A.Given the accumulated depreciation and the annual depreciation expense.
B.Given the ending gross investment and the annual depreciation expense.
C.Given the ending net investment and the annual depreciation expense.
解释：
C is correct.
Remaining useful life = ending net PP&E / annual depreciation expense.
为何不考虑salvage value?
