Johnson & Co. uses FIFO cost method in a periodic inventory system. At December 31, 2020 the accounting records provided the following inventory information:

	Unit cost	Units
Beg. balance, January 1	$12	1,200
Purchase, April 1	$11	4,200
Purchase, July 31	$15	2,200

The company had 4,000 units unsold as of December 31.

What is the total cost of sales in 2020?

please answer with detailed explanation