To calculate the sale price of the bicycle after a 20% discount, you can follow these steps:
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Calculate 20% of the original price ($164): \[ 20% \text{ of } 164 = 0.20 \times 164 = 32.8 \]
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Subtract the discount from the original price to find the sale price: \[ 164 - 32.8 = 131.2 \]
Thus, Ethan will pay $131.20 for the bicycle during the sale. However, none of the provided options match this amount. Please revisit the options or check for any errors in the calculations.