German for X rays where 'X'  means   'unknown'. In Europe X-rays are known as Roentgen rays.    X-Radiation is a form of electromagnetic radiation having a  wavelength of   0.01 to 10 nanometers.NS2: The name x-ray was applied to radiation in the same frequency as gamma radiation but which originate from a man-made source.
wikiHow to Calculate Gross Profit Margin. Gross profit is a fairly simple comparison of the cost of the goods your company sells to the income derived from those goods. Gross profit margin is the ratio of gross profit to total revenue expressed as a percentage.
Step 1. Subtract the total costs of your goods from the revenues the sales generate to find your gross profit. For example, if you purchase $10,000 of goods and sell them for $11,800, you would subtract $10,000 from $11,800 to get a profit of $1,800.Step 2.Divide your gross profit by your total revenue generated.tep 1. Subtract the total costs of your goods from the revenues the sales generate to find your gross profit. For example, if you purchase $10,000 of goods and sell them for $11,800, you would subtract $10,000 from $11,800 to get a profit of $1,800. Step 2. Divide your gross profit by your total revenue generated.