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In a city, two newspapers X and Y are published. It is known that 25% of the city's population reads X, 20% reads Y, and 8% reads both X and Y. Of those who read only X (and not Y), 30% look at advertisements. Of those who read only Y (and not X), 40% look at advertisements. Of those who read both X and Y, 50% look at advertisements. What is the percentage of the city's population that looks at advertisements?
- 12.8
- 13.5
- 13.9
- 13
Correct answer: 13.9
Solution
The percentage viewing ads = 30% of 17% + 40% of 12% + 50% of 8% = 5.1 + 4.8 + 4.0 = 13.9%. Each reader group contributes independently to the total.
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