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.
Definition: Operating profit is the profitability of the business, before taking into account interest and taxes. To determine operating profit, operating expenses are subtracted from gross profit.Operating profit is a key number for managers to watch as it reflects the revenue and expenses that they can control.Operating profit and EBIT (earnings before interest and taxes) are the same thing.o determine operating profit, operating expenses are subtracted from gross profit. Operating profit is a key number for managers to watch as it reflects the revenue and expenses that they can control. Operating profit and EBIT (earnings before interest and taxes) are the same thing.