A 0.36m square prestressed concrete pile is to be driven in a clayey soil having an unconfined compressive strength of 1

[answerhappygod]

A 0.36m square prestressed concrete pile is to be driven in a
clayey soil having an unconfined compressive strength of 110
kPa. Allowable capacity of the pile is 360 kN with a factor of
safety of 2. Unit weight of clay is 18 kN/m3. Use 𝛽=0.28. Compute
for the length of the pile.