The question asks us to find the percentage difference between the population of City 'C' and City 'B' based on the provided data table. To do this, we first need to calculate the total population for both City 'C' and City 'B' using the given percentages and numbers.

Calculating Population of City C

In City C, we are given the number of males and the percentages of females and transgenders.

• Number of Males = 8000
• Percentage of Females = 35%
• Percentage of Transgenders = 15%

The total percentage of Females and Transgenders in City C is:

\( \text{Percentage of Females + Percentage of Transgenders} = 35\% + 15\% = 50\% \)

This means the remaining population, which are the males, constitute the rest of the percentage:

\( \text{Percentage of Males} = 100\% - 50\% = 50\% \)

So, 50% of the total population of City C is equal to 8000. We can use this to find the total population of City C.

Let the total population of City C be \(P_C\). Then:

\( 50\% \text{ of } P_C = 8000 \)

\( 0.50 \times P_C = 8000 \)

\( P_C = \frac{8000}{0.50} \)

\( P_C = 16000 \)

The total population of City C is 16000.

Calculating Population of City B

In City B, we are given the number of females and the percentages of males and transgenders.

• Percentage of Males = 50%
• Number of Females = 3000
• Percentage of Transgenders = 35%

The total percentage of Males and Transgenders in City B is:

\( \text{Percentage of Males + Percentage of Transgenders} = 50\% + 35\% = 85\% \)

This means the remaining population, which are the females, constitute the rest of the percentage:

\( \text{Percentage of Females} = 100\% - 85\% = 15\% \)

So, 15% of the total population of City B is equal to 3000. We can use this to find the total population of City B.

Let the total population of City B be \(P_B\). Then:

\( 15\% \text{ of } P_B = 3000 \)

\( 0.15 \times P_B = 3000 \)

\( P_B = \frac{3000}{0.15} \)

\( P_B = 20000 \)

The total population of City B is 20000.

Calculating Percentage Less

Now we need to find out what percentage less is the population of City C compared to the population of City B. The formula for percentage less is:

\( \text{Percentage Less} = \frac{\text{Value 1} - \text{Value 2}}{\text{Value 1}} \times 100 \)

In this case, Value 1 is the population of City B (20000) and Value 2 is the population of City C (16000).

Difference in population = Population of City B - Population of City C

\( \text{Difference} = 20000 - 16000 = 4000 \)

Now, calculate the percentage less:

\( \text{Percentage Less} = \frac{\text{Difference}}{\text{Population of City B}} \times 100 \)

\( \text{Percentage Less} = \frac{4000}{20000} \times 100 \)

\( \text{Percentage Less} = \frac{4}{20} \times 100 \)

\( \text{Percentage Less} = \frac{1}{5} \times 100 \)

\( \text{Percentage Less} = 0.20 \times 100 \)

\( \text{Percentage Less} = 20\% \)

The population of City C is 20% less than the population of City B.

Revision Table: Key Data and Calculations

Additional Information: Data Interpretation Concepts

Data interpretation questions often involve tables, charts, and graphs that require careful reading and calculation. Key concepts used here include:

• Percentage Calculation: Understanding how to find a part of a whole or the whole when a part and its percentage are known. The formula \( \text{Part} = \frac{\text{Percentage}}{100} \times \text{Whole} \) and rearrangements are fundamental.
• Percentage Difference/Change: Calculating how much a value has changed relative to an original value. The formula for percentage less is \( \frac{\text{Original Value} - \text{New Value}}{\text{Original Value}} \times 100 \).
• Analyzing Table Data: Extracting relevant information from rows and columns and understanding the units (numbers or percentages).

These skills are crucial for solving quantitative aptitude problems based on data sets like this population break-up table.