A$-$ Based on above regression output, formulate an equation to estimate Sales of a store based on square footage $($sq$.$ feet$),$ Showroom Inventory, Advertising Budget, Market Size, and # of local competitors.

B$-$ Observe the significant$-$F in ANOVA table and comment on the goodness of the regression at $1\%$ significant level. Is this regression suitable for application in sales estimation? Explain.

C$-$ What percentage of variation in Sales is explained by use of these independent variables? Explain.

D$-$ Rank the independent variables based on their degree of contribution to Sales $($highest contribution to lowest contribution.$)$

E$-$ If the advertising budget is increased by $$20,000,$ what is the incremental increase in Sales?