A brokerage firm erroneously confirms to a customer a purchase of 100 shares of XYZ Corporation at 28.25. The firm later finds that the purchase was actually made at28.75. What is the customer's situation?
1) The customer gains $0.50 per share
2) The customer loses $0.50 per share
3) The customer gains $50 in total
4) The customer loses $50 in total
