Given the following information, determine the amount to order using the fixed$-$interval model. $($Round your answer to a whole number.$)$ Use Table B$.2$

$\backslash$table$[[\backslash$table$[[d=42$ units per day$],[{}_d=4$ units per day$],[LT=3$ days$]],\backslash$table$[[$Desired service level$],[$Amount on hand at reorder time$],[$OI$]],\backslash$table$[[=0\mathrm{.}99$ percent$],[=77$ units$],[=7$ days$]]]]$