Company X is engaged in the import of garden furniture. The following is a breakdown of inventory transactions (cash purchases and cash sales) for 2020:

Date	Operation	Units	Price Per Unit
1.1.2020	Opening Balance	6000	30
11.5.2020	Buy	4000	40
10.7.2020	Sell	(5000)	?
26.9.2020	Buy	3000	25
22.11.2020	Sell	(6000)	?
31.12.2020	Closing balance	?

Additional data:

Assume that under each of the inventory methods, the company has a gross profit of 20% of sales (that is, the amount of sales varies depending on the inventory method).

Required:

1. Based on the above data, what is the inventory method in which the amount of gross profit in the period is the highest?

2. Show the amount of sales, gross profit and closing inventory you found under section 1