To find out how much Valentina paid, we'll need to calculate the total cost of the items first and then add the sales tax.
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Calculate the total cost of the shirts: \[ 3 \text{ shirts} \times $15.99 = $47.97 \]
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Calculate the total cost of the pants: \[ 2 \text{ pairs of pants} \times $25.00 = $50.00 \]
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Calculate the cost of the shoes: \[ 1 \text{ pair of shoes} \times $39.99 = $39.99 \]
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Add the costs together: \[ $47.97 + $50.00 + $39.99 = $137.96 \]
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Calculate the sales tax: \[ \text{Sales tax} = 5% \text{ of } $137.96 = 0.05 \times 137.96 = $6.898 \approx $6.90 \]
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Add the sales tax to the total cost: \[ $137.96 + $6.90 = $144.86 \]
Therefore, the total amount Valentina paid is $144.86.
The correct response is: $144.86.