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
Merchandise Margin. Merchandise margin is the amount or percentage of the profits earned after covering production costs. Production costs include the materials, labor and equipment used, but does not include other costs, such as administrative, marketing or leasing costs for equipment or space. These costs fall under a business' operating margin.