To calculate the price of the jacket after the discount, first find the amount of the discount:
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Calculate the discount amount: \[ \text{Discount} = \text{Regular Price} \times \text{Discount Rate} = 50 \times 0.20 = 10 \]
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Subtract the discount from the regular price: \[ \text{Sale Price} = \text{Regular Price} - \text{Discount} = 50 - 10 = 40 \]
Therefore, the price of the jacket after the discount is $40.