The following table shows the order book for a particular stock:

Buy Sell Price Shares Price Shares $15.58 100 $15.60 200 $15.55 250 $15.62 300 $15.53 200 $15.64 200 $15.51 100 $15.66 100 Suppose that a limit order to sell 175 shares at $15.58 is followed by a market order to sell 50 shares. After these orders, what is the missing number (????) in the revised table below?

(Enter your answer as a whole number without commas or decimals, e.g. 123.)

Buy Price Shares $15.55 ???? $15.53 200 $15.51 100