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
Best Answer: A profit margin refers to a measure of profitability. It is calculated by finding the net profit as a percentage of the revenue. Where as the operating margin, is the ratio of operating income divided by net sales, usually presented in percent. The profit margin is an indicator of a company's pricing policies and its ability to control costs.