To calculate the percent increase in the price of the veggie sandwich, you can follow these steps:
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Find the difference in price: \[ \text{Difference} = \text{New Price} - \text{Old Price} = 8.39 - 6.50 = 1.89 \]
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Calculate the percent increase: \[ \text{Percent Increase} = \left( \frac{\text{Difference}}{\text{Old Price}} \right) \times 100 = \left( \frac{1.89}{6.50} \right) \times 100 \]
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Perform the calculation: \[ \frac{1.89}{6.50} \approx 0.2900 \] \[ \text{Percent Increase} \approx 0.2900 \times 100 \approx 29.00 \]
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Round to the nearest whole percent: \[ \text{Percent Increase} \approx 29% \]
Therefore, the percent increase in the price of the veggie sandwich is 29%.