To calculate the sales tax on Kevin's purchases of 4 folding chairs, we first need to determine the total cost of the chairs before tax.
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Calculate the total cost of the chairs: \[ \text{Total cost} = \text{number of chairs} \times \text{cost per chair} = 4 \times 13.50 = 54.00 \]
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Now, calculate the sales tax: \[ \text{Sales tax} = \text{Total cost} \times \text{sales tax rate} \] Convert the sales tax percentage to decimal form: \[ \text{Sales tax rate} = 6.5% = 0.065 \] So, the sales tax calculation becomes: \[ \text{Sales tax} = 54.00 \times 0.065 = 3.51 \]
Thus, the amount of sales tax for Kevin's purchases is \($3.51\).
\[ \boxed{3.51} \]