Inventory by Three Methods; Cost of Goods Sold

The units of an item available for sale during the year were as follows

Jan. $1$ Inventory $22$ units at $$1,800$ each

June $9$ Purchase $29$ units at $$1,950$ each

July $28$ Purchase $14$ units at $$2,040$ each $.$

Nov. $1$ Purchase $17$ units at $$2,100$ each

There are $18$ units of the item in the physical inventory at December $31$