Brett Wilkinson, Attorney, began the year with total assets of $120,000, liabilities of $70,000, and owner's equity of $50,000. During the year he earned reve- nue of $1 10,000 and paid expenses of $30,000. He also withdrew $60,000 for living expenses. How much is Wilkinson's equity at year-end?

a. $90,000

b. $120,000

c. $70,000

d. $160,000