please help solve

Consider the following limit-order book for a share of stock. The last trade in the stock occurred at a price of $104. Limit Buy Orders Limit Sell Orders Price Shares Price Shares $ 103.75 500 $ 104.25 200 103.50 400 104.50 200 103.25 500 107.75 300 103.00 300 111.25 100 102.50 700 a. If a market sell order for 1000 shares comes in, at what price will it be filled? b. At what price would the next market buy order be filled