To determine whether Glenda has been billed correctly for her online purchase, we need to calculate the total cost step by step.
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Calculate the cost of the picture frames:
- 4 picture frames at $12.95 each: \[ 4 \times 12.95 = 51.80 \]
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Calculate the cost of the mats:
- 4 mats at $5.89 each: \[ 4 \times 5.89 = 23.56 \]
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Calculate the subtotal for the purchase: \[ \text{Subtotal} = 51.80 + 23.56 = 75.36 \]
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Calculate the sales tax (6.5% of the subtotal): \[ \text{Sales Tax} = 0.065 \times 75.36 = 4.9024 \approx 4.90 \]
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Calculate the total before shipping: \[ \text{Total Before Shipping} = \text{Subtotal} + \text{Sales Tax} = 75.36 + 4.90 = 80.26 \]
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Determine the shipping charge:
- Since the total before shipping ($80.26) falls in the range of $50 up to $100, the express shipping charge is $8.20.
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Calculate the final total: \[ \text{Final Total} = 80.26 + 8.20 = 88.46 \]
Now, let's compare the calculated final total of $88.46 with the amount Glenda was billed ($91.86):
- Determine if there is a discrepancy: \[ \text{Difference} = 91.86 - 88.46 = 3.40 \]
Since Glenda was overcharged by $3.40, the correct answer is: c. Glenda has been overcharged by $3.40 for her purchase.