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You want 500ug i.e. 0.5mg/ml. You have 100mg. So you need 200ml of solvent. This is because 100/0.5*1 is 200ml.
5 times
200ml of solution x 20% of alcohol = 40ml of alcohol..
That is 7.055 ounces.
You can fill 15 bottles of 200ml with a 3L jug of cordial.