Answer
4899
Work Step by Step
$q=\sqrt \frac{2fM}{k}=\sqrt\frac{2(60)(100.000)}{0.50}\approx4898.98$
$T(4899)\approx2449.48974$ and $T(4898)\approx2449.48979$, so ordering 4899 units of the drug each time minimizes the annual cost
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