To calculate the percent error in Ikea's prediction, we will first need to determine the actual amount spent versus the predicted amount and then use the formula for percent error.
- Predicted amount: $30
- Actual amount spent: $19.75
Next, we calculate the percent error using the formula:
\[ \text{Percent Error} = \left( \frac{\text{Predicted Amount} - \text{Actual Amount}}{\text{Predicted Amount}} \right) \times 100 \]
Substituting the values in:
\[ \text{Percent Error} = \left( \frac{30 - 19.75}{30} \right) \times 100 \]
Calculating the difference:
\[ 30 - 19.75 = 10.25 \]
Now, divide by the predicted amount:
\[ \frac{10.25}{30} \approx 0.34167 \]
Now, multiply by 100:
\[ 0.34167 \times 100 \approx 34.17 \]
Rounding to the nearest whole number gives us approximately 34%.
None of the answer choices (A 2%, B 58%, C 1%, D 52%) match this calculation of 34%. Please verify the options or the numbers involved in the question.