Emily Company uses a periodic inventory system. At the end of the annual accounting period, December $31$ of the current year, the accounting records provided the following information for product $2$:

Units Unit Cost

Inventory, December $31,$ prior year $2,820$ $ $15$

For the current year:

Purchase, April $118,92016$

Purchase, June $17,93021$

Sales $($$$52$ each$)10,840$

Operating expenses $($excluding income tax expense$)$ $ $185,500$

Required:

Prepare a separate income statement through pretax income that details cost of goods sold for $($a$)$ Case A: FIFO and $($b$)$ Case B: LIFO.

Compute the difference between the pretax income and the ending inventory amount for the two cases.

Which inventory costing method may be preferred for income tax purposes?