Question 4 (1 point) If the FIFO inventory cost flow method results in the highest ending inventory balance (among all inventory cost flow methods), which of the following must be true? Per unit inventory cost is increasing over time Per unit inventory cost is decreasing over time Number of units purchased is increasing over time Number of units purchased is decreasing over time Save Question 5 (1 point) Which of the following inventory cost flow methods is the most costly to undertake? Perpetual average cost O Periodic LIFO Specific cost Perpetual FIFO