$3.$ Sue Higgins, the sales manager at The Boler Corporation, has given you the following information regarding the sales history of one of Boler's products, the candikane:

a$.$ Plot the quarterly sales data for each year.

b$.$ What seasonal index for each quarter could be used to forecast the sales of this product for year $4?$

c$.$ Forecast quarter $2$ and $3$ for year $4.$

d$.$ Assume $400$ units of demand $($actual demand$)$ for year $4$ quarter $1$ and $205$ units for year $4$ quarter $2.$ Forecast quarter $1$ for year $\backslash (5(\backslash$alpha$=\backslash$gamma$=0\mathrm{.}2)\backslash )$