Explanation:
The journal entries are as follows in the books of Concord Corporation
On June 10
 Merchandise inventory A/c Dr $8,050
               To Account payable A/c $8,050
(Being the inventory is purchased on account)                 
On June 11
Merchandise inventory A/c Dr $510
              To Cash A/c $510
(Being freight is paid by cash)
On June 12
Accounts payable A/c Dr $450
     To Merchandise Inventory A/c $450
(Being goods returned is recorded)
On June 19
Accounts payable A/c Dr $7,600     ($8,050 - $450)
     To Cash A/c $7,524               ($7,600 × 1%)
     To Merchandise Inventory A/c $76
(Being payment is recorded)