Dunno if you're trolling or not, but either way, thanks for illustrating my point.
Your question was wrong, you are asking for a 20% margin. he is right for a 20% markup.
This table is designed to assist in converting the different methods of arriving at a retail price. Use the multiplier on cost to achieve the desired margin. For example, to achieve a 33.33% margin use a 150% (1.50) multiplier. Another way to express the difference is that a markup percentage of 50% only yields a margin percentage of 33.33%. Markup, defined as the percentage added to cost to arrive at a selling price, is commonly used to price materials. If you want to mark up an item 20%, you add 20% of the item's cost to the cost. However, as we have demonstrated, a 50% markup does NOT yield a 50% margin! It is important that you utilize margin and markup properly. Here are the formulae that should help:
Margin
If the cost for an item is $500 and you want a 30% margin:
$500 / (100%-30%)
$500 / (70%)
$500 / .70 = $714.29
COST / (100%-GM%) = SELLING PRICE
A variation taught by many accountants is to also include what is known as base overhead factor (BOF). That ranges from 1.25% to 5%. The same margin with the BOF method, in this case 5%, would be as follows:
$500 / (100%-30%-5%)
$500 / (65%)
$500 / .65 = $769.23
COST / (100%-GM%-BOF%) = SELLING PRICE
In the Margin example above, do NOT make the common error of multiplying by .70! In this case that would yield a selling price of $850.00; nice if you can get it honestly but the greatest probability is that a competitor would undercut your bid at the same (anticipated) margin!
Markup
If an item cost $500 and you want to add a 20% markup:
500 X 20% = $10
$500 + $100 = $600 SELLING PRICE
The actual margin on this item is less than 20%.
($600 - 500) / $600 = 16.67%
(RETAIL - COST) / RETAIL