Question $6(12\mathrm{.}5$ points$)$

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Mayzie's Masks, LLC has an annual demand for $1,000,000$ masks and its operations are scheduled to run $50$ weeks each year. The inventory holding cost is $5\%$ of the product cost, which is $$5.$ The cost to place a single order is $$50.$ The lead time is $2$ weeks. Additionally, there are $5,000$ units in stock with scheduled receipts of $1000$ units and $5900$ back$-$ordered units. Assume constant demand and lead time. Determine demand during the review period. $($Round to the nearest whole number.$)$

None of these answers

$1,000,000$ masks

$20,000$ masks

$40,000$ masks

$141,421$ masks