You have been asked to travel to Colorado to locate a property for an environmental phase I assessment in T$1$R$1$E Section $6.$ You find an area you think might have contaminants totally $2\mathrm{.}5$ ac$.$ You write a report that states $31\%$ of the NW$1/4$ of the NW$1/4$ of the NW$1/4$ of Section $6$ of the property is affected. How did you come to that value?