Step-by-step explanation:
The journal entries are as follows
On December 31
1. Interest expense A/c Dr $380
To Interest payable A/c $380
(Being the interest expense is recorded)
2. Account receivable A/c Dr $1,820
To Service revenue A/c $1,820
(Being the unbilled amount is recorded)
3. Salaries expense A/c Dr $750
To Salaries payable A/c $750
(Being the salaries expense is recorded)