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 gross margin? Gross margin is the difference between 1) the cost to produce or purchase an item, and 2) its selling price. For example, if a company's manufacturing cost of a product is $28 and the product is sold for $40, the product's gross margin is $12 ($40 minus $28), or 30% of the selling price ($12/$40)...