The beginning of the amazing events at Krakatoa in 1883 date to May 20 when there were initial rumblings and venting from the volcano, which had been dormant for about 200 years.
A refinery margin is the revenue associated with refining petroleum, expressed as a value per volume (e.g. $/L), net of the cost of the crude oil input. The simplest refining
Net margin is the final ratio calculation derived from your income statement. It is a comparison of your bottom-line net profit to your revenue.Your net margin ratio is normally significantly lower than gross margin, because operating costs and irregular expenses are subtracted from gross profit to get net profit. The only exception is if you report a high amount of unusual revenue in a period.