Under the FIFO method, the amounts reported as ending inventory and cost of goods sold will always be the same, whether a periodic or perpetual system is used because:

Multiple choice question.

once first$-$in$,$ always first$-$in; under FIFO, costs flow in the chronological order of purchase transactions.

the timing of the question "What was the first$-$in cost$?"$ will vary depending on whether the periodic or perpetual system is used.

once first$-$in$,$ always first$-$in; under FIFO, the timing of purchase transactions will impact which costs are identified with sales transactions.

the timing of the question "What was the first$-$in cost$?"$ will vary depending on price level changes that occur over time.