A polymerization reaction at $1020$ C is $1\mathrm{.}5$th order of A $($the monomer$).$The monomer isto be treated by two equal sized mixed reactor in series where the product contents of Ais $20\%.$ An increase in production is contemplated by a reactor similar to those beingused. By what percentage can we increase the feed rate and still obtain a productcontaining no more than $20\%$ monomer if the third reactor is connected in series aftersecond reactor, and all the reactors become in series?