Negative gross area change

Hi,

Does anyone know why this answer was marked as incorrect?

Thanks,

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Hi ridlby, thanks for your question. It appears your answer was marked as incorrect because it wasn’t rounded to the nearest integer, as shown in line 5 of the answer. Without rounding, you arrived at the correct answer. Fortunately, on the exam itself, you will be told whether to give a precise number or an integer as the answer. I hope this helps!

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