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
Although we are only a few lines into the income statement, we can already calculate the gross profit margin, our first financial ratio. At its core, gross profit margin is a measurement of a company's manufacturing and distribution efficiency during the production process.