QUESTION $7$

The state of the book is:

$\backslash$table$[[,$Trader,Time,Price,Quantity,Display$],[,$Elin,$9$:$45,10\mathrm{.}20,800,$Y$],[,$Sophia,$9$:$40,10\mathrm{.}09,500,$Y$],[,$Will,$9$:$38,10\mathrm{.}09,100,$Y$],[,$Adam,$9$:$43,10\mathrm{.}05,300,$N$],[$Sell$,$Lucas,$9$:$42,10\mathrm{.}05,200,$Y$],[,,,,,],[$Buy$,$Ellen,$9$:$42,10\mathrm{.}03,400,$N$],[,$Ada,$9$:$41,10\mathrm{.}02,300,$Y$],[,$David,$9$:$43,9\mathrm{.}99,200,$Y$],[,$Renee,$9$:$44,9\mathrm{.}99,300,$N$],[,$Max,$9$:$46,9\mathrm{.}80,1000,$Y$]]$

Suppose at $9$:$46,$ Raymond submits an order, "Buy $700,$ limit $10\mathrm{.}10."$ Then

A$.$ Raymond buys $200$ from Lucas at $10\mathrm{.}05$; Raymond buys $300$ from Adam at $10\mathrm{.}05$; Raymond buys $100$ from Will at $10\mathrm{.}09$; Raymond buys $100$ from Sophia at $10\mathrm{.}09.$ Now, the best bid and offer in the market are: $10\mathrm{.}03$ bid for $400($Ellen$),400$ offered at $10\mathrm{.}09($Sophia$).$

B$.$ Raymond buys $200$ from Lticas at $10\mathrm{.}05$; Raymond buys $100$ from Will at $10\mathrm{.}09$; Raymond buys $400$ from Sophia at $10\mathrm{.}09.$ Now, the best bid and offer in the market are: $10\mathrm{.}02$ bid for $300($Ada$),100$ offered at $10\mathrm{.}09($Sophia$).$

C$.$ Raymond buys $200$ from Lucas at $10\mathrm{.}05$; Raymond buys $100$ from Will at $10\mathrm{.}09$ ; Raymond buys $400$ from Sophia at $10\mathrm{.}09.$ Now, the best bid and offer in the market are: $10\mathrm{.}03$ bid for $400($Ellen$),100$ offered at $10\mathrm{.}09($Sophia$).$

D$.$ Raymond buys $200$ from Lucas at $10\mathrm{.}05$; Raymond buys $300$ from Adam at $10\mathrm{.}05$ ; Raymond buys $100$ from Will at $10\mathrm{.}09$; Raymond buys $100$ from Sophia at $10\mathrm{.}09.$ Now, the best bid and offer in the market are: $10\mathrm{.}02$ bid for $300($Ada$),400$ offered at $10\mathrm{.}09($Sophia$).$