A steel column 3 m hight is of hollow square section, 200 mm outside dimension a

A steel column 3 m hight is of hollow square section, 200 mm outside dimension and 20 mm wall thickness. (young's modules E=210*10^9) calculate
A: the compressive load which will give a stress of 60 MN/m^2 in column.
B: the compression o the column under the load in (A).

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