A mixture of 50% n-pentane and 50% n-heptane yields a top product containing 80% n-pentane. is subjected to continuous distillation. 97% of the n-pentane in the feed goes into the top product passes. The feed is saturated liquid at boiling point. Full concentrator in process and partial evaporation boiler is used. a) Calculate upstream and downstream components( D,W) b)Calculate RD(min)