A book sold for 18.70 with 15% discount. what was the original selling price

Question

How do I find the original selling price of the book? 

Answer 1

Let x = the original price

 

Suppose you start out with an original price and then you take 15% off that price.  Your new price is $18.70.

 

Your equation will be:

 

x-0.15x=18.70

 

 

Solve for x

Answer 2

.85 x B = 18.70          .85B/.85 = 18.70/.85        B = $22.00