Final answer:
Under FIFO, the ending inventory for Snow Company after selling 1,000 units is 400 units remaining at $4.50 per unit, which calculates to $1,800.
Step-by-step explanation:
To calculate the ending inventory under the First-In, First-Out (FIFO) method, we consider the cost of the latest units remaining. Since Snow Company sells 1,000 units, it means the first 200 units from January at $4.00 are sold, plus 800 units from the April purchase at $4.25 are sold. The remaining inventory would therefore be all 400 units from the September purchase at $4.50 each. Hence, the ending inventory is calculated as:
400 units × $4.50/unit = $1,800.