The steel pipe is filled with concrete and subjected to a

Question

Problem-

The steel pipe is filled with concrete and subjected to a compressive force of about 250 kN, figure 4. The pipe has an outer diameter of 80 mm and an inner diameter of 60 mm. 

a. Determine the average compressive stress in the concrete and in the steel.
b. How far does the pipe shorten?
    E_steel = 200 GPa
    E_concrete = 24 GPa

Additional information-

This problem related to Mechanical Engineering and the problem is about finding average compressive stress of steel and concrete with concrete being poured in a steel pipe and then the pipe is compressed at 250kN. Computation for how far the steel pipe gets shortened is given in the solution.