Question:

By what percentage did the total book sales of the three stores increase from 2005 to 2010?

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To calculate percentage increase, use the formula: \[ \text{Percentage increase} = \frac{\text{New value} - \text{Old value}}{\text{Old value}} \times 100 \]
Updated On: Sep 30, 2025
  • 33.3%
  • 12%
  • 20%
  • 15%
  • 25%
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The Correct Option is C

Solution and Explanation

Step 1: Total book sales in 2005.
The sales in 2005 were:
Store A: 8 (thousands)
Store B: 12 (thousands)
Store C: 10 (thousands)
\[ \text{Total sales in 2005} = 8 + 12 + 10 = 30 \text{ (thousands)} \]
Step 2: Total book sales in 2010.
The sales in 2010 were:
Store A: 11 (thousands)
Store B: 13 (thousands)
Store C: 12 (thousands)
\[ \text{Total sales in 2010} = 11 + 13 + 12 = 36 \text{ (thousands)} \]
Step 3: Calculate the percentage increase.
\[ \text{Percentage increase} = \frac{36 - 30}{30} \times 100 = \frac{6}{30} \times 100 = 20% \]
Final Answer: \[ \boxed{20%} \]
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