To calculate how much Valentina paid, we first need to find the total cost of her purchases and then apply the sales tax.
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Calculate the cost of the shirts:
- 3 shirts at $15.99 each: \[ 3 \times 15.99 = 47.97 \]
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Calculate the cost of the pants:
- 2 pairs of pants at $25.00 each: \[ 2 \times 25.00 = 50.00 \]
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Calculate the cost of the shoes:
- 1 pair of shoes at $39.99: \[ 39.99 \]
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Add up the total cost before tax: \[ 47.97 + 50.00 + 39.99 = 137.96 \]
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Calculate the sales tax (5% of the total cost): \[ \text{Sales Tax} = 0.05 \times 137.96 = 6.898 \]
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Total cost including tax: \[ 137.96 + 6.898 = 144.858 \]
Rounding to two decimal places, the total amount Valentina paid is $144.86.
So, the correct answer is: $144.86