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 3600 5400 7200 9000 4500 2017 6480 9720 12960 16200 8100 2018 9000 13500 18000 22500 11250 2019 11520 17280 23040 28800 14400 2020 10800 16200 21600 27000 13500 2021 12600 18900 25200 31500 15750