Final answer:
The total liabilities at the end of January would be $16,000.
Step-by-step explanation:
The total liabilities on the balance sheet at the end of January can be calculated by considering the transactions:
- Purchased equipment for $9,000, paying $1,800 cash and signing a promissory note for $7,200. This increases liabilities by $7,200.
- Purchased supplies on account for $2,700. This increases liabilities by $2,700.
- Paid $1,350 on account. This decreases liabilities by $1,350.
- Received a bill for utilities for January of $6,100. This increases liabilities by $6,100.
So the total liabilities at the end of January would be $7,200 + $2,700 + $6,100 = $16,000.