Isaac placed an order with his broker to purchase 300 shares of each of three IPOs that are being released this month. Each IPO has an offer price of $24 a share. He received allocations of 300 shares of A, 25 shares of B, and 250 shares of C. On their respective first days of trading Stock A closed at $20 a share, Stock B closed at $29 a share, and Stock C closed at $25 a share. How much less did he earn on his combined first day of trading than he would have had he received his full allocation of shares for all three stocks?