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
The operating margin (also called the operating profit margin or return on sales) is a ratio that shines a light on how much money a company is actually making in profit. It is found by dividing operating income by revenue, where operating income is revenue minus operating expenses .