TherearetwotypesofresidentsinNdolaand Kitwe,professorsandstudents. Professorshaveanincomeof Y =200;studentshaveanincomeof Y =100.BothNdolaand Kitweprovideroadrepairservicesfortheircitizens.Professorsvalue roadrepairmorethanstudentsbecausetheyhavenicercars.Infact,thevalueof roadrepairtoeachindividualtakestheform( Y R )/10- R 2/2.The per-resident costofroadrepairis5

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