In a methanol production plant the distillation column has 12 trays, but we do not trust the efficiency provided by the vendor. We process a mixture of 45% methanol and the rest water. The distillate has a composition of 97% methanol, and the residue 3% methanol. The column is operated with a reflux ratio (L/D) of 1.75 and the feed is saturated liquid. Determine the efficiency of the trays assuming ideal behavior of the mixture.