Answer:
Please see below
Step-by-step explanation:
The adjusting entries include
Revenue A/c. Dr. $400
To Deferred revenue A/c. Cr $400
($1,000 - $600)
* When a company makes a journal entry to record revenue that it had previously collected in advance, which was recorded as sales revenue, then the adjusting entry to record portion of the earned revenue received in advance would include a debit to revenue a/c