A tray tower is to be designed fou$($stripping ammonia $($A$)$ from its solution in liquid water $($C$).$ The stripping tray tower must process the liqu$$d mixture containing $(8\%$ ammonia by mass, at a feed rate of $100$ kg$/$min$.$ A downstream unit receiving the liquid effluent of the desorber demands that the water delivered to it must not exceed $1\%$ ammonia by mass. Fresh steam $($B$)$ is used as the inert stripping gas at a rate of $10\%$ more than the minimum steam rate in kg$/$min$.$ The ammonia in water equilibrium is given by y$*=1\mathrm{.}7$x$".$ Estimate the number of ideal trays using the McCabe$-$Thiele graphical procedure