GeoTrack scooter needs, on average, $3,000$ tons of aluminum each week, with a standard deviation of $1200$ tons. The lead time to receive its orders is $10$ weeks. The holding cost for one ton of aluminum for one week is $$12.$ It operates with a $0\mathrm{.}99$ in$-$stock probability. Use Table $11\mathrm{.}5.$ On average, how many tons does it have on order?

A$.$

$30,000$

B$.$

$36,000$

C$.$

$5,400$

D$.$

$10,600$

TABLE $11\mathrm{.}5$ In$-$Stock Probabilities and Matching Safety Factors, $z$