The following data show the sales of products A, B, C, D and E in Sultanate of Oman. Find the four, five and six years simple moving averages and three years weighted moving average. (WEIGHTS - 2021 - 0.50, 2020 - 0.30, 2019 -0.20). Year Sales - A Sales - B Sales - C Sales - D Sales - E (RO in 000) (RO in 000) (RO in 000) (RO in 000) (RO in 000) 2016 10800 16200 21600 27000 13500 2017 19440 29160 38880 48600 24300 2018 27000 40500 54000 67500 33750 2019 34560 51840 69120 86400 43200 2020 32400 48600 64800 81000 40500 2021 37800 56700 75600 94500 47250