rita, sita, and pita are all in need of street lights in their neighborhood to illuminate the streets during their evening strolls. rita assigns a value of $100 to the lights, sita assigns them a value of $150 and pita values them at $50. the total installation cost of electric street lights is $400. what should the neighborhood association do, if rita, sita and pita are the only residents who go on their nightly strolls and yet don't have a flashlight on their phone?