Answer:
Two entries are made one for sale and the other for the promissory note.
Perez Co
Date Particulars Debit Credit
January 10, 2017 Accounts Receivable $24,600, Dr
Merchandise $24,600,Cr
Sale of merchandise on account to Robertsen Co. for $24,600, n/30.
February 9, Notes Receivable $ 24600 Dr
Accounts Receivable $24,600 Cr
Robertsen Co. gave Perez Co. a 11% promissory note in settlement of this account.
As this note is given within the 30 days no cash has been paid in settlement of the accounts receivable. If any cash had been paid the entry would have been different.