A plant has two streams containing benzene and toluene, one with 37 percent benzene and one with 68 percent benzene. About equal amounts of the two streams are available, and a distillation tower with two feed points is proposed to produce 98 per cent benzene and 99 percent toluene in the most efficient manner. However, combin ing the two streams and feeding at one point would be a simpler operation. For the same reflux rate, calculate the number of ideal stages required for the two cases.