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 Basics. In general, a margin ratio is a measure of efficiency in converting revenue dollars into profits. Gross margin compares your gross profits the revenue generated during a given period of time. Gross profit equals revenue minus cost of goods sold. A gross profit of $50,000 on revenue of $150,000 is 0.33 or 33 percent.