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.
Total Cost is fixed cost plus the sum of the marginal costs for each unit. To determine the optimal integer quantity according to the marginal analysis, we check the total profit for the integer values above and below the non-integer q. Total profit for q of 9 is $28.Total profit for q of 10 is $20.Thus, the marginal analysis shows that the optimal q is 9 with a corresponding profit of $28.o determine the optimal integer quantity according to the marginal analysis, we check the total profit for the integer values above and below the non-integer q. Total profit for q of 9 is $28. Total profit for q of 10 is $20. Thus, the marginal analysis shows that the optimal q is 9 with a corresponding profit of $28.