At the beginning of January, the Sacks Company reported total assets of $140,000, total liabilities of $50,000 and total equity of $90,000. During January the company had the following transactions:

Purchased supplies for $500 on account

Paid previously owed wages of $750

Purchased equipment for $3,500

Sold $8,500 of services to customers and sent a bill for that amount

What are the company's total liabilities at the end of January?