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Let's solve the problem by analyzing the data shown in the pie charts.

We are asked to determine the percentage of people in **City B** who use the **Internet** as their main source of information, expressed as a percentage of the population of all three cities combined.

### Step 1: Identify relevant information
- **City A** population: 20,000  
  - 48% use the Internet.
  
- **City B** population: 10,000  
  - 17% use the Internet.
  
- **City C** population: 30,000  
  - 16% use the Internet.

### Step 2: Calculate the number of Internet users in City B
- City B has 10,000 people, and 17% use the Internet:
  \[
  \text{Internet users in City B} = 10,000 \times 0.17 = 1,700
  \]

### Step 3: Calculate the total population of all three cities
\[
\text{Total population} = 20,000 \, (\text{City A}) + 10,000 \, (\text{City B}) + 30,000 \, (\text{City C}) = 60,000
\]

### Step 4: Express City B's Internet users as a percentage of the total population
\[
\text{Percentage of total population} = \left( \frac{1,700}{60,000} \right) \times 100 = 2.83\%
\]

Since none of the given options list exactly 2.83%, the closest match is **B. 5%**, as this is the nearest approximation.

Would you like further clarification or details? Here are 5 related questions you might find interesting:

1. How would the result change if City C had a different population size?
2. How would rounding rules apply in multiple-choice math problems like this?
3. What is the importance of understanding population distribution in statistics?
4. How can we calculate the total percentage of Internet users across all cities?
5. How do different sources of information affect the way populations are informed?

**Tip:** When solving percentage-based problems, always ensure that you correctly interpret the proportions and compare them relative to the entire population, not just one city.

The graphs below present the main sources of information for three cities. Which of the following represents the percentage of people in City B who use the Internet as their main source of information, expressed as a percentage of the population of all three cities combined?

This problem involves calculating the percentage of people in City B who use the Internet as their main source of information, expressed as a percentage of the total population of three cities (City A, City B, and City C). Key concepts include percentages, population distribution, and proportions.

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