To find out how much Charlie paid for the shorts, we first need to calculate the discount and then subtract that from the regular price.
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Calculate the discount: The regular price of the shorts is $24, and the discount is 45%. We can find the discount by multiplying the regular price by the discount percentage:
\[ \text{Discount} = \text{Regular Price} \times \text{Discount Percentage} = 24 \times 0.45 = 10.80 \]
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Calculate the sale price: Next, we subtract the discount from the regular price:
\[ \text{Sale Price} = \text{Regular Price} - \text{Discount} = 24 - 10.80 = 13.20 \]
Therefore, Charlie paid $13.20 for the shorts.