Differentiate fixed costs and variable costs. 1  Total cost is the sum of fixed and variable costs.  Variable costs change according to the quantity of a good or service being produced. The amount of materials and labor that is needed for to make a good increases in direct proportion to the number of goods produced.
Xtrata is a top five producer of copper, thermal coal, coking coal, ferrochrome, zinc and nickel and has operations in 19 countries. The company's copper production in 2010 was over 900 thousand metric tons and it has copper facilities located in Australia, Chile, Peru, Argentina, and Canada.
Tata Steel Europe Ltd. (formerly Corus Group plc) is a multinational steelmaking company headquartered in London, United Kingdom, it has been a wholly owned subsidiary of Tata Steel since 2007.ata surprised the credit default swap segment of the derivative markets by deciding to raise $6.17 billion of debt for the deal through a new subsidiary of Corus called 'Tata Steel UK', rather than by raising the debt itself. Tata's security credit rating is investment grade, whereas the new subsidiary may not be.