Here are the journal entries for the transactions provided:
Oct. 1:
Cash 60,000
Owner's Equity (or Capital) 60,000
Oct. 2:
Salaries and Wages Expense 2,600
Cash (for October salary) 2,600
Oct. 2:
Rent Expense 2,600
Cash 2,600
Oct. 4:
Equipment 17,000
Cash (for $3,000 payment) 3,000
Accounts Payable 14,000
Oct. 8:
Advertising Expense 600
Cash 600
Oct. 10:
Equipment Repair Expense 340
Accounts Payable 340
Oct. 12:
Accounts Receivable 3,200
Service Revenue 3,200
Oct. 16:
Supplies Expense 400
Accounts Payable 400
Oct. 21:
Accounts Payable 14,000
Cash (for balance payment) 14,000
Oct. 24:
Utilities Expense 148
Cash 148
Oct. 27:
Cash 3,200
Accounts Receivable 3,200
Oct. 31:
Salaries and Wages Expense 5,500
Cash 5,500
Please note that the account titles used may vary based on the specific chart of accounts of Sheffield Security Company.