Answer:
Step-by-step explanation:
The journal entries are shown below:
1. Adverting expense A/c Dr 600
 To Cash A/c 600
(Being the advertising expense is paid for cash)
2. Supplies A/c Dr 1,200
 To Accounts payable 1,200
(Being the supplies are purchased on account)
3. Cash A/c Dr 2,400
 To Service revenue A/c 2,400
(Being the cash is received)
4. Salaries expense A/c Dr 800
 To Cash A/c 800
(Being the salaries expense is paid for cash)
5. Account receivable A/c Dr 900
 To Service revenue A/c 900
(Being the services provided is recorded)
6. Utilities expense A/c Dr 200
 To Cash A/c 200
(Being the utilities expense is paid for cash)