Well, that design isn't going to work, either. I think about the only thing I can do is to try to change the concentration of the stream that is leaving Earle Hall. I need my recycle stream to contain $99\%$ of the acetone that leaves Earle, and have a mass $\%$ of acetone of $95\%($or else I can't reuse it$),$ and I need the stream that is sent to the city's sewer to have $1$ mass $\%$ acetone. What is the mass $\%$ of acetone in the stream leaving Earle that makes this possible? Assume that the stream leaving Earle Hall is still $250,000$ lbm every day.