To find the total amount Valentina paid, we will first calculate the total cost of the shirts, pants, and shoes before tax, and then add the sales tax.
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Calculate the total cost of the shirts: \[ \text{Cost of shirts} = 3 \text{ shirts} \times 15.99 = 47.97 \]
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Calculate the total cost of the pants: \[ \text{Cost of pants} = 2 \text{ pairs} \times 25.00 = 50.00 \]
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Cost of the shoes: \[ \text{Cost of shoes} = 39.99 \]
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Total cost before tax: \[ \text{Total cost before tax} = \text{Cost of shirts} + \text{Cost of pants} + \text{Cost of shoes} \] \[ = 47.97 + 50.00 + 39.99 = 137.96 \]
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Calculate the sales tax: \[ \text{Sales tax} = 137.96 \times 0.05 = 6.898 \]
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Total cost including tax: \[ \text{Total cost} = \text{Total cost before tax} + \text{Sales tax} \] \[ = 137.96 + 6.898 = 144.858 \]
Rounded to two decimal places, the total cost is: \[ 144.86 \]
Thus, Valentina paid $144.86.
The correct response is: $144.86.