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
Gross margin is the difference between net revenue and cost of goods sold, or COGS, divided by revenue, expressed as a percentage.Generally, it is calculated as the selling price of an item, less the cost of goods sold (production or acquisition costs, essentially).ross Margin (%) = (Revenue â Cost of goods sold) / Revenue. It can be expressed in absolute terms: Gross margin = net sales â cost of goods sold + annual sales return. or as the ratio of gross profit to revenue, usually in the form of a percentage: