SOLUTION: The sales price of a car is $12,590, which is 20% off the original price. What is the original price?

There are two ways to do this.

First way:

Original price - 20% of original price = 12590

         x     - .2x                   = 12590

Multiply thru by 10 to remove decimals:

        10x   -   2x                   = 125900

                                    8x = 125900
                                     x = $15737.50

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The other way.  When you reduce something by 20% you
leave 80% of it.  So we think this way:

        12590 is 80% of what?

        12590 = .8x

        x = 

        x = $15737.50

Edwin