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
Profit Margin: The profit margin is one of the most used profitability ratios. The profit margin refers to the amount of profit that a company earns through sales. The profit margin ratio is broadly the ratio of profit to total sales times one hundred percent.