To determine the selling price of the roller derby skates, we first need to calculate the amount of the markup and then add it to the cost price.
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Calculate the markup: \[ \text{Markup} = \text{Cost} \times \text{Markup Percentage} = 47.25 \times 0.36 \]
\[ \text{Markup} = 47.25 \times 0.36 = 17.01 \]
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Calculate the selling price: \[ \text{Selling Price} = \text{Cost} + \text{Markup} = 47.25 + 17.01 \]
\[ \text{Selling Price} = 64.26 \]
Therefore, the selling price of the roller derby skates is $64.26.