One teaspoon is equivalent to 4.92892 milliliters which is
very close to 5 milliliter. So the computation would be dividing the 325 milligrams
to the 1 teaspoon then multiplying it to 1 teaspoon divided by 5 milliliters
then multiplying that to the 0.4 milliliter of potassium iodide.
Milligrams contained = (325 mg / 1 tsp) x (1 tsp / 5 mL) x
0.4 mL = 26 milligrams is the answer.
