Arsha predicted that she would sell 225 magnets. She actually sold 240 magnets. 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 Magnets 225 240 A b

The error is the exact value minus the approximate value: 240 − 225 = 15. The ratio uses the exact value as the denominator, so A = 15/240. Converting this ratio to a percent gives 15 ÷ 240 × 100 = 6.25%, so the correct choice is C: A is 15/240 and b is 6.25%.

AI-written and checked against the verified answer.