User wants to add $128$k EPROMs and $128$k SRAMs to a PC using the $74138$s to decode the $32$k x$8$ memory blocks $($EPROMs and SRAMs$)$ controlled by Ys$.$ Addresses available start $50000$H and another D$0000\mathrm{.}1.$ How many memory block required from EPROMs and SRAMS?$2$Determine the typical range address of added EPROMs and SRAMs?$3$Determine the range of each memory block controlled by Ys$?4.$ Design and draw the memory decoding using $74138$ circuitries in which the memory block controlled by Ys$?$