Pedro predicted that he would sell 128 novels. He actually sold 150 novels. What are the values of A and b in the given table? Percent Error Item Approximate value Exact value Error Absolute error Ratio Percent error Novels 128 150 A b

The error is the approximate value minus the exact value: 128 − 150 = −22. Its absolute value is 22, so the percent error is 22 ÷ 150 × 100% ≈ 14.7%; the exact value is the denominator. Thus A is 22/150 and b is 14.7%, as in choice A.

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