San Rulz Interlors provldes deslgn servlces to resldenllol and commerclel cllents_ The resldenllol servlces produce contrlbutlon margln of $470,000 and have traceable fixed operatlng costs of S500,OOO_ Management Is studylng whether to drop the resldenllel operatlom If closed, the fixed operatlng costs wlll fall by S3go,ooo end San Rulz' Income wlll: Multiple Choice o o o o o decrease by $80.000. increase by $80.000_ increase by $360,000. increase by $30,000. decrease by ESO.OOO_