Step 1: Understanding the Concept:
The question asks for the "combined market share" of three specific brands. This requires us to sum the individual market share percentages of those brands.
Step 2: Detailed Explanation:
First, identify the market shares for the brands in question from the provided data:
- Market Share of Brand A = 30%
- Market Share of Brand B = 25%
- Market Share of Brand C = 20%
Next, add these percentages together to find the combined market share:
\[ \text{Combined Share} = \text{Share A} + \text{Share B} + \text{Share C} \]
\[ \text{Combined Share} = 30% + 25% + 20% \]
\[ \text{Combined Share} = 75% \]
Step 3: Final Answer:
The combined market share of Brand A, Brand B, and Brand C is 75%.