QUESTION $10$

The state of the book is:

$\backslash$table$[[,$Trader,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$,9$:$42,10\mathrm{.}05,200,$Y$,],[$Buy$,,,,,],[,$Lucas,$9$:$42,10\mathrm{.}03,400,N$