Bescha predicted that she would sell 500 handmade vases at a flower show. When the show was over, she had 50 vases left. What was the percent error in the estimate? Round the answer to the nearest tenth.

She sold 500 − 50 = 450 vases, so 450 is the actual number sold. Percent error is the absolute difference between the estimate and actual value divided by the actual value: |500 − 450| ÷ 450 × 100 ≈ 11.1%. The correct choice is 11.1%.

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