Question
In a survey of 1,000 people, 40% preferred Brand X, 30% preferred Brand Y, and the remaining 30% had no preference. If the survey sample is expanded to 2,500 people, how many additional people are expected to prefer Brand X, assuming the proportions remain the same?
Solution
Required answer = 40% of 2500 – 40% of 1000 = 40% of 1500 = 600
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