Transactions for the Sheldon Cooper Company, which provides welding services, for the month of June are presented as follows.

June
1 Sheldon Cooper invests $4,000 cash in exchange for shares of common stock in a small welding business.
2 Purchases equipment on account for $1,200. 3 Pays $800 cash to landlord for June rent.
12 Bills P. Leonard $300 after completing welding work done on account.

Required:
Identify the accounts to be debited and credited for each transaction.