Cynthia's Design Studios had sales the last four months of $$13,700,$ $$15,400,$ $$17,450,$ and $$18,700.$ Sales are related to how many designers Cynthia has on$-$duty. The sales forecast helps her decide on the proper staffing levels. Round your answers to the nearest whole number. a$.$ What is the forecast for the fifth month using a two$-$period moving average? b$.$ What is the forecast for the fifth month using $\backslash$alpha $=0\mathrm{.}9$ in an exponential smoothing model with A$4=18,700$ and F$4=$ $$17,013$ to get things started.