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A steel column is 90cm long and 150mm diameter. If a hole 100mm diameter and 60cm long is bored out, calculate the total compression of the column when carrying a load of 1MN. Take the modulus of elasticity for steel, E = 200 GN/m squared.

I have done similar questions to this before but have never learnt how to calculate the compression of a bored out steel column!

Any help on how to start this off will be very much appreciated!!