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Chapter 12
5.6 Multiplicative model
Month Actual Sales Trend Seasonal variation
Jan 74
Feb 100 89 12% or 112%
Mar 93 93 0
Apr 86 97 –11% or 89%
May 112 101 11% or 111%
Jun 105 105 0
Jul 98 109 10% or 90%
Aug 124 113 –10% or 110%
Sept 117 117 0
Oct 110 121 –9% or 91%
Nov 136 125 9% or 109%
Dec 129
Extrapolate trend and then apply the appropriate variation
204
