A integrated recycling and recovery plant from selected recyclable wastes based on door$-$collection has been developed. There are various types of wastes received as portrayed in figure.

a$)$ Describe the similarities and differences of the wastes collected as shown in the figure Figure $1$: Domestic Waste

b$)$ Based on the figure, suggest the most suitable and economical plant to treat the Justify your suggestions by describing potential benefits or impacts socially, environmental financially.