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# @CPhill

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The sellling price of a book is a dollars after 20% discount. What was the original price?

Guest Nov 30, 2017
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#1
+18
0

a/.2

or

1/.2=2

it might be either of these depending on what you meant. I didn't understand if you meant a dollars as in a is a variable, or as a dollars as in 1 dollar.

If you meant a as a variable it is a/.2.

if you meant a as in 1 it is 1/.2=2

Hope this helped!

dom6547  Nov 30, 2017
#2
+505
+1

That doesn't seem right... why would it be 5a? I think it is either \$1.25 or $$\frac{5a}{4}$$dollars. A 20% disount reduces the price to 80% of the original cost, not 20%!

helperid1839321  Nov 30, 2017
#3
+79819
+2

Let P be the original price

So...taking 20% off = .20P

So

P  - .20P  = "a"

P ( 1 - .20)  =  "a"

P (.80)  = "a"      divide both sides by .80

P  = "a"  /  .80

CPhill  Nov 30, 2017

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