If the actual sales for the years 2018, 2019, 2020 and 2021 were $400, $600, $600, and $700 respectively. Calculate the sales forecasted for the year 2022 using the following methods: a) Simple moving average? (10 Points) b) Weighted moving average, if the weights was 0.4 for the immediate preceding year, and 0.3, 0.25, and 0.05 for the three years before that. (15 Points) c) Exponential smoothing given a weight a of 0.4, and assuming that the forecasted value for the year 2020 was $800. (15 Points) d) Simple Regression Model method. (10 Points)