The cover of the pressure vessel with an inner diameter of 500mm and an internal pressure of 1.2 MPa is to be fastened w

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The cover of the pressure vessel with an inner diameter of 500mmand an internal pressure of 1.2 MPa is to be fastened with 12bolts. When the pressure is applied to the cover, setting thefastening force of the cover to 1/2 of the pressure and answer thefollowing questions.
bolt only acts tensile force, allowable tensile stress:60MPa
bolt spring : 8*10^5 N/mm
gasket spring constant : 4*10^4 N/mm
determine minor bolt diameter (mm) and Initial tension tobe applied to the bolt by internal pressure (kN)
answer: 25mm and 26.18kN
Please solve step by step with CLEAR explanation.
No cursive writing plz, write clearly so that anyone canunderstand easily.
Thanks in advance!