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

 Nov 30, 2017
 #1
avatar+91 
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!

 Nov 30, 2017
 #2
avatar+568 
+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%!

 Nov 30, 2017
 #3
avatar+100587 
+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

 

 

cool cool cool

 Nov 30, 2017

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