Answer:
$100
Step-by-step explanation:
The computation is shown below;
We know that
Cost of material used = Beginning balance of raw material inventory + purchase made during the month - ending balance of raw material inventory
$900 = Beginning balance of raw material inventory + $1,000 - $200
$900 = Beginning balance of raw material inventory + $800
So, the Beginning balance of raw material inventory would be
= $900 - $800
= $100