7) [15] Sales of Volkswagen's popular Beetle at a car dealer for the past four years is as shown below: a) [3] What is year 5 forecast according to the 2 -year simple moving average method? b) [3] What is year 5 forecast according to the 2 -year weighted moving average method with weights 4 and 1 , respectively, for the last year and the year before? c) [4] What is year 5 forecast according to the exponential smoothing method with =0.3 ? d) [5] Find the MAPE for each of these three methods above. Which one would you choose to forecast year 5 sales