Answer:
b.$9,290
Explanation:
Calculation for What was the balance of Work in Process as of April 30
WORK IN PROCESS=[(61,100+191,300+57,390)-306,600]+6,100
WORK IN PROCESS=(309,790-306,600)+6,100
WORK IN PROCESS=3,160+6,100
WORK IN PROCESS=$9,290
Therefore the balance of Work in Process as of April 30 will be $9,290