Nicole Corporation uses the periodic inventory system and the following information about their laptop computers is available:

Date Transaction Number of Units Cost per unit

1/1 Beginning Inventory 200 $30

5/5 Purchase 800 $32

8/10 Purchase 1,200 $35

10/15 Purchase 800 $36

During the year 2018, 2,400 laptop computers were sold.

1. What was ending inventory under the LIFO cost flow assumption
2. What was cost of goods sold under the FIFO cost flow assumption
3. What was ending inventory under the weighted average cost flow assumption?
4. Which of the above cost flow assumptions could generate the lowest pretax-income for Nicole in 2018?