A single-effect evaporator concentrates 600 lb/h of 25% MgSO4 solution entering at 160F. The saturated steam supplied of 200 lb/h is at 35.4 psia. The pressure in vapor space of the evaporator is 6 psia. The boiling point elevation of the concentrated solution is 60F. The relation of the MgSO4 solution enthalpy (H, Btu/lb) with temperature ( T, F) and mass fraction (w) is expressed as H = 0.275T^1.2 + 1.8w + 78. a) Calculate the concentration of concentrated solution from the evaporator. (30 marks) b) Determine the economy of this process.