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
Gross Margin Definition. Gross profit margin is the simplest and most basic margin calculation. It equals revenue minus cost of goods sold, divided by revenue. It shows how well the company gets good deals on purchases and turns them into high revenues. If the company generates $10,000 in revenue with COGS of $7,000, its gross profit is $3,000. Dividing $3,000 by $10,000, you get .3, or 30 percent for gross margin. Margins are expressed as a percentage.