Answer and Explanation:
As per the data given in the question, 
Apr-01 Accounts receivable A/c Dr. $6,900 
To Sales A/c $6,900 
Apr-01 Cost of goods sold A/C Dr. $2,760 
 To Inventory A/c $2,760 
( Being cost of goods on merchandise is recorded)
Jun-10 Allowance for doubtful debt A/c Dr. $ 4,600 
Cash A/c Dr. $2,300 
To Accounts receivable A/c $6,900 
( Being bad debt expense is recorded) 
Oct-11 Accounts receivable A/c Dr. $4,600 
To Allowance for doubtful debt A/c $4,600 
( Being bad debt recovered is recorded)
Oct-11 Cash Dr. $4,600 
To Accounts receivable A/c $4,600
( Being cash recovered from bad debt is recorded)