Answer:
June 1 Sheldon Cooper invests $4,000 cash in exchange for shares of common stock in a small welding business.
Account Debited: Cash
Account Credited: Common Stock capital
2 Purchases equipment on account for $1,200.
Account Debited: Equipment
Account Credited: Accounts Payable
3 Pays $800 cash to landlord for June rent.
Account Debited: Rent expense
Account Credited: Cash account
12 Bills P. Leonard $300 after completing welding work done on account.
Account Debited: Accounts receivable
Account Credited: Service revenue