A driven closed$-$ended pile, circular in cross section, is shown in the figure below.

Calculate the following:

a$.$ The ultimate point load using Meyerhof's procedure.

b$.$ The ultimate frictional resistance $Q_s.[$Use Eqs. $(11\mathrm{.}45)$ through $(11\mathrm{.}47)$ and take K

$=1\mathrm{.}4$ and ${}^{\text{'}}=0\mathrm{.}6{}^{\text{'}}.]$

FOR PART $"$B$"$ SHOW CLEAR STEPS AND EXPLANATION PLEASE