Here are the journal entries for the transactions of the Plumbing Repair Company during its first month of operation:
September 1:
Cash 100,000
Common Stock (20,000 shares) 100,000
(To record the issuance of 20,000 shares of $5 par value common stock for $100,000 cash deposit.)
Prepaid Insurance 3,000
Cash 3,000
(To record the payment for insurance for the year.)
September 2:
Prepaid Rent 3,500
Cash 3,500
(To record the payment of one month's rent for the warehouse.)
September 5:
Plumbing Equipment 25,000
Cash 5,000
Accounts Payable 20,000
(To record the purchase of plumbing equipment with a $5,000 down payment and $20,000 on account.)
September 6:
Supplies 2,000
Accounts Payable 2,000
(To record the purchase of supplies on account.)
September 7:
Advertising Expense 750
Cash 750
(To record the payment for advertising in local newspapers.)
September 10:
Cash 15,000
Service Revenue 15,000
(To record the receipt of $15,000 in cash for plumbing services provided.)
September 12:
Accounts Payable 5,000
Cash 5,000
(To record the payment for the plumbing equipment purchased on account.)
September 15:
Accounts Receivable 2,500
Service Revenue 2,500
(To record the provision of plumbing services on account for $2,500.)
September 23:
Cash 22,000
Accounts Receivable 22,000
(To record the receipt of $22,000 in cash for plumbing services provided on account.)
September 25:
Cash 1,500
Accounts Receivable 1,500
(To record the receipt of $1,500 cash for plumbing services performed on account on September 15th.)
September 28:
Utilities Expense 500
Cash 500
(To record the payment for a utility bill.)
September 30:
Dividends 1,000
Cash 1,000
(To record the payment of cash dividends.)
Insurance Expense 250
Prepaid Insurance 250
(To record the expired insurance for one month.)
September 30:
Supplies Expense 1,200
Supplies 1,200
(To record the adjustment for the supplies on hand at the end of the month.)
Please note that these journal entries are based on the provided information and may be subject to accounting policies and conventions followed by the Plumbing Repair Company.