The monthly demand for units manufactured by the Rocket Company has been as follows: Use the exponential smoothing method to forecast June to January. The initial forecast for May was 100 units; a = 0.1. . Calculate the absolute percentage error starting from June and the MAD and MAPE of forecast error. Study the impact of a on the performance of your forecasting method i.e. calculate MAD, and MAPE for a = 0.2, 0.3 and 0.4, and compare the result Month May June July August September October November December January Units 100 102 108 114 110 112 118 125