Walton County Schools are considering replacing grass surfaces with artificial surfaces at its four high schools. Three companies are bidding for the project with different turf solutions. Given IRRs below, which option should WCS choose if the WACC is 6.7%? Walton Turf = 5.1% Astro Surfaces = 7.1% Enviro Grass = 8.5% Astro Surfaces Enviro Grass Walton Turf