Answer:
Date                 Particular                         Debit    Credit
May 10, 2020  No Entry (Note 1)                $0     $0
                          (To record contact entered into)
June 15, 2020  Account Receivable A/c  $1,810 
                                 To Sales Revenue A/c            $1,810 
                          (To record Sales)
June 15, 2020   Cost of goods sold A/c.    $1,050
                                 To Inventory A/c                        $1,050
                          (To record cost of goods sold)
July 15, 2020     Cash A/c                             $1,810 
                                  To Account Receivable A/c      $1,810 
                           (To record payment received)