Explain how to solve Question $3(25$ points$)$

Consider the demand for rock salt used primarily to melt snow. This salt is produced by a firm called Tahoe Salt, which sells its salt through a variety of independent retailers around the Lake Tahoe area of the Sierra Nevada Mountains. In the past, Tahoe Salt has relied on estimates of demand from a sample of its retailers, but the company has noticed that these retailers always overestimate their purchases, leaving Tahoe $($and even some retailers$)$ stuck with excess inventory. After meeting with its retailers, Tahoe has decided to produce a collaborative forecast. Tahoe Salt wants to work with the retailers to create a more accurate forecast based on the actual retail sales of their salt. The sales records for the salt in the past year $(12$ months$)$ has been collected in the table in the next page. The manager wants to use the Holt's model with Alpha $=0\mathrm{.}1$ and Beta $=0\mathrm{.}1$ for forecasting the sales in the future. Answer the following questions. $($Only Excel files are accepted for this question$)$

a$)$ Calculated the initial values for level and trend $($ T $*0=$ And L $*0=(4$ Points$)$

b$)$ Forecast the demand for periods $1$ to $12.(10$ Points$)$

c$)$ Calculate the TS$\_$t factor for periods $1$ to $12$ and determine whether the Holt's method is acceptable for this data set or not. $(10$ Points$)$

d$)$ What is the expected sale for period $15($ F $15=?)?(1$ Point$)$

$2$