To find the sale price of the backpack that originally costs \( b \) dollars and is on sale for 75% off, we first calculate how much is taken off the original price.
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Calculate the discount: The discount amount for 75% off can be calculated as: \[ 0.75b \]
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Determine the sale price: To find the sale price, subtract the discount from the original price: \[ \text{Sale Price} = b - 0.75b \]
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Simplify the sale price: \[ \text{Sale Price} = 1b - 0.75b = 0.25b \]
Therefore, the sale price of the backpack can be represented by the expression \( 0.25b \).
Consequently, the correct expression(s) that represent the sale price of the backpack is:
- \( 0.25b \)