Homework 9 Estimate the most economic cost of the one-way truss on truss subsystem (Pl.see the attached figure. Ignoring bucking problem in truss).Total vertical design load on the truss subsystem is 10kN/m2.You can only choice two types for steel tubes with section area of 50cm2 and 25cm2.The steel tubes in main span truss have the same section.The tubes in secondary span truss have the same section.The design strength of steel tube is 200N/mm2.The unit price of steel tube in truss is 10000RMB/T.Homework 9 Estimate the most economic cost of the one-way truss on truss subsystem (Pl. see the attached figure. Ignoring bucking problem in truss). Total vertical design load on the truss subsystem is 10kN/m². You can only choice two types for steel tubes with section area of 50cm²and 25cm². The steel tubes in main span truss have the same section. The tubes in secondary span truss have the same section. The design strength of steel tube is 200N/mm². The unit price of steel tube in truss is 10000RMB/T