Anita Limited has shared their annual sales revenue over the last 6 financial years from 2015 to 2020.

Year Sales($000)

2015 4500

2016 5100

2017 4900

2018 5400

2019 5670

2020 6000

1. Using linear trend equation forecast the sales revenue of Anita Limited for 2021.
2. Calculate the forecasted sales difference if you use3-period weighted moving average designed with the following weights:2018 (0.1), 2019 (0.3) and 2020(0.6).