4.3 The price of a coat after the discount is \( \$ 21 \). What was the original price? Show your work! The original price of the coat was \( \$ \)
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To find the original price of the coat before the discount, we first need to know the discount rate. Let's assume the coat was discounted by a percentage, denoted as \( d \). The formula for the price after a discount can be given by: \[ \text{Price after discount} = \text{Original Price} \times (1 - \frac{d}{100}) \] If we let \( P \) be the original price, we have: \[ 21 = P \times (1 - \frac{d}{100}) \] If we rearrange the equation to solve for \( P \): \[ P = \frac{21}{(1 - \frac{d}{100})} \] Now you can plug in the actual discount percentage if you have it to find the original price of the coat! If the discount was, say, 30%, then it becomes: \[ P = \frac{21}{(1 - 0.3)} = \frac{21}{0.7} = 30 \] So in that case, the original price was \( \$30 \). Note that you can replace the 30% with any other discount rate to calculate different original prices!