The following are the sales amount {in RM) of a company over the last 7 days. a) By using 3-days weighted moving average as given : Yn= 0.5 le + (1.3 Yn_2+ {1.2 Yn_3 predict the sales on 8 Oct and 9 Oct. An additional column of numbers must be constructed. b) By using exponential smoothing with or = 0.6. \"- VI+I ='E'i +0'.(Y:, _i) where 0 S or, S I predict the sales on 8 Oct. An additional column of numbers must be constructed. c} Can the sales on 9 Oct be predicted using exponential smoothing? Give grief reasons to your