Answer:
Oct 1
DR Cash............................................................................$20,000
CR Common Stock.........................................................................$20,000
Oct 2. No entry required
Oct 3
DR Office Furniture .....................................................$2,300
CR Accounts Payable................................................................$2,300
Oct 6
DR Accounts Receivable.............................................$3,600
CR Service Revenue - Realty services...................................$3,600
Oct 27
DR Accounts Payable ..................................................$850
CR Cash .......................................................................................$850
Oct 30
DR Salaries Expense ....................................................$2,500
CR Cash ..........................................................................................$2,500