To find out how much Valentina paid in total, we need to calculate the total cost of the items before tax, and then apply the sales tax.
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Calculate the total cost of the shirts: \[ \text{Total cost of shirts} = 3 , \text{shirts} \times 15.99 , \text{per shirt} = 47.97 \]
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Calculate the total cost of the pants: \[ \text{Total cost of pants} = 2 , \text{pairs of pants} \times 25.00 , \text{per pair} = 50.00 \]
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Calculate the total cost of the shoes: \[ \text{Cost of shoes} = 39.99 \]
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Calculate the total cost before tax: \[ \text{Total cost before tax} = 47.97 + 50.00 + 39.99 = 137.96 \]
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Calculate the sales tax: \[ \text{Sales tax} = 137.96 \times 0.05 = 6.898 \]
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Calculate the total cost including tax: \[ \text{Total cost including tax} = 137.96 + 6.898 \approx 144.86 \]
Therefore, the total amount Valentina paid is $144.86.
The correct response is: $144.86