To find out how much Valentina paid in total, we will calculate the cost of the shirts, pants, and shoes, and then add the sales tax.
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Calculate the total cost of the shirts: \[ \text{Cost of shirts} = 3 \times 15.99 = 47.97 \]
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Calculate the total cost of the pants: \[ \text{Cost of pants} = 2 \times 25 = 50.00 \]
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Calculate the total cost of the shoes: \[ \text{Cost of shoes} = 1 \times 39.99 = 39.99 \]
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Calculate the total cost before tax: \[ \text{Total cost} = \text{Cost of shirts} + \text{Cost of pants} + \text{Cost of shoes} \] \[ \text{Total cost} = 47.97 + 50.00 + 39.99 = 137.96 \]
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Calculate the sales tax: \[ \text{Sales tax} = 0.05 \times 137.96 = 6.898 \]
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Calculate the total amount paid including tax: \[ \text{Total amount paid} = \text{Total cost} + \text{Sales tax} \] \[ \text{Total amount paid} = 137.96 + 6.898 = 144.858 \]
Rounded to two decimal places, Valentina paid: \[ \text{Total amount paid} \approx 144.86 \]
Therefore, Valentina paid $144.86.