We will investigate how to determine a selling price of a product given at a discounted rate.
The original price ( O ) of the computer that Alex bought is:

The selling price of the computer is expressed as a fraction of the original price ( O ) as follows:

Using the above expression we will plug in the value of original price of the computer and solve for its selling price as follows:

Alex paid at the selling price ( S ) for the computer with a discount of ( D ) as follows:
