Southern Consolidated manufactures gas turbines. Some of the parts are bought from outside, while the important ones are made in the company’s plant. CZ-43 is an important part that wears out in approximately 2 years and has to be replaced. This means CZ-43 has to be manufactured not only to meet demand at the assembly line but also to satisfy its demand as a spare part. The gas turbine was first sold in 2002 and the demand for CZ-43 for 2002–2015 is given below. Forecast the total demand for CZ-43 for 2016.

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Year Spare Part Assembly Demand 2002 3 87 90 2003 6 48 54 2004 14 43 57 2005 30 31 61 2006 41 49 90 2007 46 31 77 2008 42 37 79 2009 60 42 102 2010 58 47 105 2011 67 32 99 2012 70 25 95 2013 58 29 87 2014 57 30 87 2015 85 23 108