To determine if Glenda has been billed correctly, let's calculate the total cost of her purchase step by step.
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Calculate the cost of picture frames: \[ \text{Cost of picture frames} = 4 \times 12.95 = 51.80 \]
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Calculate the cost of mats: \[ \text{Cost of mats} = 4 \times 5.89 = 23.56 \]
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Calculate the subtotal (total of picture frames and mats): \[ \text{Subtotal} = 51.80 + 23.56 = 75.36 \]
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Calculate the sales tax (6.5% of subtotal): \[ \text{Sales tax} = 0.065 \times 75.36 \approx 4.91 \]
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Calculate the total before shipping: \[ \text{Total before shipping} = 75.36 + 4.91 = 80.27 \]
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Determine the shipping cost. Since the total before shipping is $80.27, we refer to the shipping charge table:
- Express Shipping: For amounts between $50 and $100, the charge is $8.20.
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Calculate the total cost including shipping: \[ \text{Total cost} = 80.27 + 8.20 = 88.47 \]
Now we compare the calculated total cost of $88.47 with Glenda's billed amount of $91.86.
- Determine if there is a discrepancy: \[ \text{Discrepancy} = 91.86 - 88.47 = 3.39 \]
This means Glenda has been overcharged.
Since the question options suggest approximate amounts, the closest choice is:
d. Glenda has been overcharged by $3.80 for her purchase.
Therefore, the correct answer appears to indicate minor calculation differences, so the choice that best reflects this scenario given the options is: c. Glenda has been overcharged by $3.40 for her purchase.