a pressed concrete pile $400$mm$*400$mm is driven into clay to a depth of $24$m $.$ the clay has a cohesion of $0\mathrm{.}38$ kg$/$cm$2.$ ignoring the resistance due to skin friction for the top $3$ m of the pile, adhension factor of $\mathrm{.}80,$ calculate safe pile capacity using factor of safety $2.$ the soil density is $1650$ kg$/$m$3.$