Tammy predicted that she would sell 300 bottles of water. She actually sold 350 bottles. What is the percent error in the estimate of the number of bottles sold? Round the answer to the nearest tenth.

Percent error is the absolute difference between the estimate and actual value divided by the actual value, then multiplied by 100. The difference is |300 − 350| = 50, so 50 ÷ 350 × 100 ≈ 14.3%. The correct choice is 14.3%.

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