问题如下：
Which inventory accounting method results in the lowest inventory turnover ratio for the first quarter?
选项：
A.Periodic LIFO
B.Perpetual LIFO
C.Perpetual FIFO
解释：
A is correct.
In an environment with falling inventory costs and declining inventory levels, periodic LIFO will result in a higher ending inventory value and lower cost of goods sold versus perpetual LIFO and perpetual FIFO methods. This results in a lower inventory turnover ratio, which is calculated as follows:
Inventory turnover ratio = Cost of goods sold/Ending inventory
The inventory turnover ratio using periodic LIFO is $39,000/$16,000 = 244% or 2.44 times.
The inventory turnover ratio using perpetual LIFO is 279% or 2.79 times, which is provided in Table 2 (= 40,500/14,500 from previous question).
The inventory turnover for perpetual FIFO is $41,400/$13,600 = 304% or 3.04 times
老师，好：
分母不应该是存货期初期末的均值么？为什么这里直接用的ending呢？
