___ is the practice of marking up prices by 100 percent (or doubling the cost to set the selling price). Marketing Chapter 20 ___ is the practice of marking up prices by 100 percent (or doubling the cost to set the selling price). a. Margin pricing b. Keystoning c. Mark-on adding d. Formula doubling e. Symmetrical pricing ANSWER: b Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+