Answer:
Shrinkage = Closing inventory according to the books - Actual closing inventory after physical count
Closing inventory = Beginning inventory + Purchased inventory - Sold inventory
= 13,800 + 42,600 - 35,700
= $20,700
Date          Account Title                 Debit        Credit
XX-XX-XXXX   Cost of Goods sold          $20,700
             Merchandise inventory                    $20,700