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
What is 'Contribution Margin'. Contribution margin is a cost accounting concept that allows a company to determine the profitability of individual products. The phrase contribution margin can also refer to a per unit measure of a product's gross operating margin calculated simply as the product's price minus its total variable costs.