 Quandaries and Queries • name...Nick • who is asking the question (other) Using the calculation on your website, if I sell something for \$885 and my cost is \$296, I make \$589 profit.  How do I calculate the profit percent I made on that transaction?   • Profit as a percentage of what it cost me? • Profit as a percentage of what I sold it for? Also, how do I calculate the "mark up" percentage from cost(\$296) to sell(\$855)? • e.g.     \$296 x ______% =  \$855   Also, how do I calculate the "discount" percentage from sell(\$855) to cost(\$296)? • e.g.     \$855 x ______% =   \$296 Thank you, and looking forward to your answers. Hi Nick, From the way you ask the question I think that you understand what the problem is. We quite often say percent without saying percent of what. You certainly can express the profit of \$589 as a percentage of what it cost you  589/296 100 = 199% of what it cost you or as a percentage of what you sold it for  589/855 100 = 69% of what you sold it for. If you said to me "My profit on this item was xx%"I would probably think that you meant xx% of what it cost you, but you might be thinking "I just sold that item to you for \$855 and 69% of that amount is my profit." It's the sloppy way we use the language that is the problem. For markup you added \$589 to the \$296 it cost you, so the markup is \$589. You then have \$296 x ______% =  \$589 The missing number is 589/296 100 = 199% so the markup is 199% of what it cost you. For your expression \$855 x ______% =   \$296 the missing number is 296/855 100 = 35%, so your cost is 35% of the selling price. This is probably not the definitive answer you were looking for but the language of percent is confusing at times. Penny Go to Math Central