If Y which is ratio of mass of solvent to mass of solvent in liquid free phase:For extract is 0.5 (YD)For extract leaving stage N is 0.7 (YVN)Amount of extract is 100kg (D)Amount of solvent in cascade is 50 (SD)What is the extract reflux?

• A. 100
• B. 150
• C. 200
• D. 250