To do this, we can set up a proportion:
$$\frac{10,000 \text{ units}}{40 \text{ mL}} = \frac{x \text{ units}}{1 \text{ mL}}$$
Now, we can solve for x:
$$x = \frac{10,000 \text{ units}}{40 \text{ mL}}$$
$$x = 250 \text{ units/mL}$$
Now that we know there are
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