Find the total volume of the drink and the portion that is apple juice.<br><br>
&bull; Total drink per batch = 50 + 75 + 100 = 225 ml<br>
&bull; Apple juice = 75 ml<br>
&bull; Fraction = \(\frac{75}{225} = \frac{75 \div 75}{225 \div 75} = \frac{1}{3}\)<br>
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Final Answer: \(\frac{1}{3}\)