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The unsold books of store A are approximately what percent more or less than the total unsold books of stores B and C combined?

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**Solution:**

1. Calculate the unsold books for store A:
   - Total books = 3500
   - Sold = 20\% of 3500 = 0.20 	imes 3500 = 700
   - Unsold = 3500 - 700 = 2800

2. Calculate the unsold books for store B:
   - Total books = 5000
   - Sold = 40\% of 5000 = 0.40 	imes 5000 = 2000
   - Unsold = 5000 - 2000 = 3000

3. Calculate the unsold books for store C:
   - Total books = 4500
   - Sold = 30\% of 4500 = 0.30 	imes 4500 = 1350
   - Unsold = 4500 - 1350 = 3150

4. Total unsold books of stores B and C together:
   $$3000 + 3150 = 6150$$

5. Find the percentage difference of unsold books of store A compared to B and C combined:
   $$	ext{Percentage difference} = \frac{6150 - 2800}{6150} 	imes 100 = \frac{3350}{6150} 	imes 100 \approx 54.47\%$$

Rounding off, the unsold books of store A are approximately **54\% less** than the total unsold books of stores B and C together.

**Answer:** 54\%

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