Sparty Corporation adjusts its accounts only at year-end. The following information is available as a source for preparing adjusting entries at December 31, 2021.

1. On September 31, 2021, Sparty sold 100 one-year subscriptions for their monthly publication at $44 each, with the subscriptions starting October 1. When Sparty received the $4,400 in subscription payments it credited the liability account titled Unearned Subscription Revenue.

2. On May 1, 2021, Sparty paid $36,000 for a two-year insurance policy. When Sparty paid the $36,000 it recognized the entire amount as a debit to an asset account titled Prepaid Insurance.

3. Sparty failed to recognize $900 in rent for December owed to Sparty by one of Spartys tenant that rents a part of Spartys building.

4. The Supplies Inventory account had a $30,000 balance at the beginning of the year (January 1, 2021). During the year, $10,000 of supplies were acquired, with the Supplies Expense account debited at the time of purchase. The supplies count at the end of the year (December 31, 2021) showed $25,000 of supplies still on hand.

For each of the above numbered items, prepare the necessary adjusting journal entry. If no adjusting entry is required, explain why.