Question: Create T$-$accounts for RM inventory, WIP inventory, FG inventory, and COGS. Enter any appropiate begging balances and record any amounts that would have been debited or credited to these accounts during the year. Lastly, determine ending balances for all four accounts.

Ending Balances

$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

RM inventory: $$120$

WIP inventory: $$40$

FG inventory: $$80$

COGS: $ $???$

I wrote $3,540$ as the answer for COGS. But, it is the wrong answer. So$,$ what is the correct answer for COGS?