Problem#$2$: $(40)$

The four$-$unit separation train shown in the following diagram has been designed to separate a hydrocarbon mixture containing $20\%$ methane $(C_1),25\%$ ethane $(C_2),40\%$ propane $(C_3)$ and the remainder butane $(C_4)$ into five fractions. With the compositions in molar percentage:

Calculate all streams in the process, considering that stream $5$ has a flow of $1000mo\frac{l}{h}$ and that the recirculation to unit I is $50\%$ of stream $5.$ It is recommended to start the balance sheet in column II$.$

Give the "default" tables for all streams $N_1$ to $N_{11}.$