Answer:
$35,100
Step-by-step explanation:
Use following formula
Cost of Ending work in process inventory = Cost of beginning work in process inventory + Cost added during the month - Cost transferred during the month
$13100 = Cost of beginning work in process inventory + $415,000 - $437,000
$13100 = Cost of beginning work in process inventory - $22,000
Cost of beginning work in process inventory = $13100 + $22,000
Cost of beginning work in process inventory = $$35,100