Let's carefully analyze the question step-by-step to determine the correct answer.
1. Understanding Proof:
The term "proof" is a measure of the strength of an alcoholic drink. Specifically:
- Proof is defined as twice the percentage of alcohol by volume (ABV) in the beverage.
- For example, a drink with an alcohol content of 40% ABV would be 80 proof.
2. Given Information:
- The drink contains 50% alcohol by volume.
3. Calculating the Proof:
- Using the definition of proof, we need to multiply the percentage of alcohol by 2.
[tex]\[
\text{Proof} = \text{Alcohol Percentage} \times 2
\][/tex]
- Plugging in the given alcohol percentage:
[tex]\[
\text{Proof} = 50\% \times 2
\][/tex]
4. Performing the Calculation:
- To complete the calculation, we simply multiply:
[tex]\[
\text{Proof} = 50 \times 2 = 100
\][/tex]
Therefore, a drink that contains 50% alcohol is considered 100 proof.
The correct answer is:
100 proof.
