What do i need to debit and credit

Apr 3 Sold inventory costing $5,480 to ADC Corp to credit for $4,839. Terms 4/10 net 30

Apr 11 ADC Corp paid their account for full amount

Apr 15 Purchased Inventory costing $3787 from Maple Bay Corp. on credit. Terms 4/10 net 30

April 18 Quenton Corp discovered that $1223 worth of merchandise is defective and returned to Maple Bay Corp for adjustment to the account