pls help solves $($a$,$b$,$c$)$ using excel, pls show all work so i can understand

a$.$ Assume that you were at the end of June in the first year. Forecast for the rest of the months $($one month ahead forecasts$),$ month by month, using both simple exponential smoothing method $($alpha$=0\mathrm{.}1)$ and moving average with window length $6.$ Compare the performance of the two methods based on MAPE

b$.$Plot the errors produced by the simple exponential method and comment about the errors and the bias issue.

c$.$ Do item a again, and try two more alpha values and two more window lengths that you will pick. See if you can find a better forecasting model for the data.