Answer:
The journal entry to record this note collection carried out by the bank should be:
Dr Cash 21,200
Cr Notes receivable 20,000
Cr Interest revenue 1,200
Explanation:
Notes receivable is an asset account and it probably represented a sale made on credit by the company, so when it was collected, the amount should decrease and that is done by crediting it.
On the other hand, since only $20,000 belonged to the note, the rest ($1,200) must be recorded as interest revenue. Revenues are always credited.