Periodic Inventory Using FIFO, LIFO, and Weighted Average Cost Methods

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

Jan. $1$Inventory$40$units at $$165$$$6,600$Aug. $13$Purchase$200$units at $$18036,000$Nov. $30$Purchase$60$units at $$20012,000$Available for sale$300$units$$54,600$

There are $75$ units of the item in the physical inventory at December $31.$ The periodic inventory system is used. Determine the inventory cost using the $($a$)$ first$-$in$,$ first$-$out $($FIFO$)$ method; $($b$)$ last$-$in$,$ first$-$out $($LIFO$)$ method; and $($c$)$ weighted average cost method