Subway, with more than $25,000$ outlets in the U$.$S$.,$ is planning for a new restaurant in Buffalo, New York.

Three locations are being considered. The following table gives the factors for each site.

$\backslash$table$[[$FACTOR$,$WEIGHT,MAITLAND,$\backslash$table$[[$BAPTIST$],[$CHURCH$]],\backslash$table$[[$NORTHSIDE$],[$MALL$]]],[$Space$,\mathrm{.}30,60,70,80],[$Costs$,\mathrm{.}25,40,80,30],[$Traffic density,$\mathrm{.}20,50,80,60],[\backslash$table$[[$Neighborhood$],[$income$]],\mathrm{.}15,50,70,40],[$Zoning laws,$\mathrm{.}10,80,20,90]]$

a$)$ Select the suitable site by factor rating method at which Subway should open the new restaurant?

b$)$ If the weights for Space and Traffic density are reversed, select the suitable site for new scores?