Answer:
$302.
Step-by-step explanation:
FIFO is an inventory management method. As the name says, First-In First-Out, it assumes that the oldest recorded inventory is sold first. This can be the assumption of management as the goods sold can be the ones that were recently purchased. So, the cost of oldest inventory is to be charged Cost of Goods Sold first and then that of the recent ones, if any.
Calculation
Gadgets Sold = 10 + 50 - 8 = 52 gadgets were sold during the period. Under the FIFO cost flow assumption, the cost of oldest gadgets that is $50 (10 * 5) is to be charged to P&L first and then of the newer ones which is $252 (42 * 6). This makes the total cost of goods sold for month to be $302 (252 + 50).