8.12. Given the following average demand for each month, calculate the seasonal indices for each month.

Note that your answer, if done correctly, should have all the seasonal indices add up to the number of periods in the entire season, in this case 12.

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Month Average Demand Seasonal Index January 30 February 50 March 85 April 110 May 125 June 245 July 255 August 135 September 100 October 90 November 50 December 30 Total