Bernard Office Equipment, which uses a perpetual inventory system, experienced a normal inventory shrinkage of $19,290. (a)

Question:

Bernard Office Equipment, which uses a perpetual inventory system, experienced a normal inventory shrinkage of $19,290.
(a) What accounts would be debited and credited to record the adjustment for the inventory shrinkage at the end of the accounting period?
(b) What are some causes of inventory shrinkage?