b$)$ A separator is used to separate four components of $A,B,C$ and $D.$ The feed to the separator contains $13wt\%A,37\mathrm{.}1wt\%B,21\mathrm{.}5wt\%C$ and the balance is $D.$ The products of the separator are two streams of different compositions. The upper product stream has a composition of $10\mathrm{.}9wt\%$A and $39\mathrm{.}5wt\%B$ with $C$ and $D$ making up the remainder. The upper stream flows at $780k\frac{g}{h}.$ The bottom product stream contains all four components with $25\mathrm{.}9wt\%B$ and $38\mathrm{.}5wt\%C.$

i$.$ Draw a process flow diagram of the process.

ii$.$ Determine the flow rate of the inlet and bottom product stream.

iii. Determine the composition of components $C$ and $D$ at the upper stream and components A and $D$ at the bottom stream.