On March 31, the financial information of XYZ company are as follows: capital on March 1 $300,000, owner's contribution $150,000, owner's withdrawals $50,000, expenses $70,000, and revenues $100,000. What is the amount of owner's equity as of March 31 of the current year? OA $500,000 OB. $550,000 OC $430,000 OD. $480,000