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You bought a phone for $640.00. It has been on sale for 20% off. What was the phone's original price? Guest Sep 11, 2017 Sort: ### 3+0 Answers #1 +76108 +2 Let the original price = P And 20% off the original price = .20P So Original Price - [ 20% off ] = 640 ... so.. P - .20P = 640 simplify .80P = 640 divide both sides by .80 P = 640 / .80 = 800 So.....the original price was$800

CPhill  Sep 12, 2017
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The original price is \$800.00

Guest Sep 12, 2017
#3
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Let x = phone's original price

Let 0.2 (20%) = discount of phone

Let 640 = price of phone after discount

$$0.2x=x-640$$

$$0.2x-x=x-640-x$$

$$-0.8x=x-640-x$$

$$-0.8x=-640-0$$

$$-0.8x=-640$$

$$\frac{-0.8x}{-0.8}=\frac{-640}{-0.8}$$

$$1x=\frac{-640}{-0.8}$$

$$x=\frac{-640}{-0.8}$$

$$x=800$$

gibsonj338  Sep 12, 2017

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