A firm has a market value equal to its book value. Currently, the firm has excess cash of $1,000, other assets of $5,000, and equity of $6,000. The firm has 600 shares of stock outstanding and net income of $800. The firm has decided to spend half of its excess cash on a share repurchase program. How many shares of stock will be outstanding after the stock repurchase is completed?

550 shares

570 shares

510 shares

530 shares

590 shares