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
Definition. Gross profit margin (gross margin) is the ratio of gross profit (gross sales less cost of sales) to sales revenue.It is the percentage by which gross profits exceed production costs. Gross margins reveal how much a company earns taking into consideration the costs that it incurs for producing its products or services.efinition. Gross profit margin (gross margin) is the ratio of gross profit (gross sales less cost of sales) to sales revenue.