Dr, Durango uses job order costing in his dental practice. Some services, like root canals, involve multiple visits, often over more than a month's time. At the end of May. Dr. Durango had three patients with partially completed procedures. Patient A had incurred direct material costs of $250, direct labor costs of $300, and overhead of $50. Patient B had direct material costs of $150, direct labor costs of $150, and overhead of $30. Patient C had direct material costs of $300, direct labor costs of $300 and overhead of $100. What was the total work in process inventory account at the end of May? A $1, 630 B $1, 750 C $1, 575 D $1, 825