Sam predicted that he would sell 15 mugs, but he actually sold 20 mugs. Which expression would find the percent error? Use the given table to help answer the question. Percent Error Item Approximate value Exact value Error Absolute error Ratio Percent error Mugs 15 20 negative 5 5

Percent error is the absolute error divided by the exact value, then multiplied by 100. Here, the absolute error is 5 mugs and the exact number sold is 20, so the expression is 5 over 20 times 100. Choice D gives this calculation; using 15 would divide by the approximate value instead.

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