William Beville's computer training school, in Richmond, stocks workbooks with the following characteristics:

$\backslash$table$[[$Demand D$,19,500$ units$/$year$],[$Ordering cost S$,$$$\frac{23}{?}$ order$],[$Holding cost $H,$$$\frac{5}{?}$ unit$/$year$]]$

a$)$ The EOQ for the workbooks is $($round your response to the nearest whole number$).$