Answer
$\frac{1}{2}$ oz
Work Step by Step
given a bottle holds 2$\frac{1}{2}$ oz of medicine
$\frac{1}{5}$ part of medicine is alcohol
therefore we need to find the ounces of alcohol the bottle contains
= $\frac{1}{5}$ x 2$\frac{1}{2}$ oz
=$\frac{1}{5}$ x $\frac{5}{2}$ oz
=$\frac{1}{2}$ oz