To find the sale price of the shirt, first, calculate the amount of the discount:
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Calculate 25% of the original price ($20): \[ \text{Discount} = 20 \times 0.25 = 5 \]
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Subtract the discount from the original price: \[ \text{Sale Price} = 20 - 5 = 15 \]
So, the shirt will cost $15 after the 25% discount.