To find the sale price of the gas stove, we first need to calculate the amount of the discount and then subtract that from the original price.
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Calculate the discount: \[ \text{Discount} = \text{Original Price} \times \text{Discount Rate} = 749 \times 0.30 = 224.70 \]
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Subtract the discount from the original price to find the sale price: \[ \text{Sale Price} = \text{Original Price} - \text{Discount} = 749 - 224.70 = 524.30 \]
Thus, the sale price of the gas stove is $524.30.
The correct answer is B. $524.30.