Answer:
$59.00.
Explanation:
Because it is perpetual method we will check the inventory available at the moment of each sale.
First sale:
Inventory Available Jan 1st 10 units at $4
sales 6 units COGS $4 = 24
Second Sale:
Inventory Available Jan 1st 4 units at $4 $16
Jan 17th 8 units at $5.5 $44
Total 12 untis at $60 = 60/12 = $5 per unit
sales 7 units COGS $5 = 35
Total COGS 35 + 24 = 59