Given the following Quantity Divewent Shedule

$\backslash$table$[[$Discount Number,Discount quentify,Olateunt $x,$Digeoumt sont $($$$)],[1,010499,0,545],[2,300$ to $999,15,$To be completed$],[3,1090$ to $1599,25,$Ta be kumpletted$],[4,1500$ to more,$1\mathrm{.}5,$To be cumpleted$]]$

It the purehesing reot per unit is $$45,$ the ordering cost pei crider tis $$94,$ the annual demand is $7200.$ units, and the holding cost is $21\%$ of the purchasing cost per unit. What order quantily will minimiae the tot al inventory cost?