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2. The monthly demand for units manufactured by the Acme Rocket Company has been as follows: Units Month Units Month May June 100 105 80 110 September October November December July 110 125 August 115 120 a. Use the exponential smoothing method to forecast the number of units for June to January. The initial forecast for May was 105 units; a = 0.2. b. Calculate the absolute percentage error for each month from June through December and the MAD and MAPE of forecast error as of the end of December.