The following stream at \(100^{\circ} \mathrm{F}\) and 250 psia is to be separated into the four indicated products. Also, given is the cost of each of the unique separators. Determine:

(a) The best sequence

(b) The second-best sequence

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Percent Recovery Feed Product Product Product Product Species Symbol (lbmol/hr) 1 2 3 4 Propane A 100 98 i-Butane B 300 98 n-Butane C 500 98 i-Pentane D 400 98 Unique Separator Cost ($/yr) A/B 26,100 B/C 94,900 C/D 59,300 A/BC 39,500 AB/C 119,800 B/CD 112,600 BC/D 76,800 A/BCD 47,100 AB/CD 140,500 ABC/D 94,500