QUESTION FIVE The manager of a company is preparing revenue plans for the last quarter of 1993/94 and for the first three quarters of 1994/5. The data below refer to one of the main products: Revenu April-June July-Sept Oct-Dec Jan-March e Quarter 1 Quarter 2 Quarter 3 Quarter 4 E'000 E'000 E'000 E'000 f'000 1990/91 49 37 58 67 1991/92 50 38 59 68 1992/93 51 40 60 70 1993/94 50 42 61 Required: a) Calculate the four-quarterly moving average trend for this set of data. b) Calculate the seasonal factors using either the additive model or the multiplicative model, but not both