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# Trent told his friends it would take him 90 minutes to mow the lawn. It really took him 100 minutes. What was his percent error?

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Trent told his friends it would take him 90 minutes to mow the lawn. It really took him 100 minutes. What was his percent error?

Jan 8, 2023

$$\frac{100-90}{90}=\frac{1}{9}=11.1\%$$