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 profit margin -- also called gross margin -- is an overall measure of the total profit on sales that a company makes after subtracting only those costs directly associated with production. As such, it doesn't show the company's overall profitability. Instead, it establishes the relationship between production costs and total sales revenue. Gross profit margin appears on a company's income statement as the difference between sales revenue and cost of goods sold: Gross Profit Margin = total sales revenue - total direct costs of goods sold. What Is Contribution Margin?