To find the sale price of the phone that was originally $199 and marked down by 15%, you can follow these steps:
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Calculate the amount of the discount: \[ \text{Discount} = \text{Original Price} \times \text{Discount Rate} = 199 \times 0.15 = 29.85 \]
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Subtract the discount from the original price to find the sale price: \[ \text{Sale Price} = \text{Original Price} - \text{Discount} = 199 - 29.85 = 169.15 \]
Thus, the sale price of the phone is $169.15.