To determine how much Alexis owes after using a 20% off coupon, first, we need to calculate her total purchases before applying the coupon.
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Calculate individual costs:
- Pack of markers: $2.50
- Lunch box: $5.25
- Two shirts: \( 2 \times 7.99 = 15.98 \)
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Calculate total cost before discount: \[ \text{Total cost} = 2.50 + 5.25 + 15.98 = 23.73 \]
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Calculate the discount amount: \[ \text{Discount} = 20% \text{ of } 23.73 = 0.20 \times 23.73 = 4.746 \]
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Calculate total after discount: \[ \text{Total after discount} = 23.73 - 4.746 \approx 18.984 \]
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Round to two decimal places: \[ \text{Total owed} \approx 18.98 \]
Thus, Alexis owes approximately $18.98.