SITUATION: A rectangular footing, $3m4m$ in plan, is founded $1\mathrm{.}2m$ below the ground surface for

which the bulk unit weight of the soil is $20k\frac{N}{m^3},$ the cohesion strength is $10$kPa and the angle

of internal friction is $20$ degrees. Under the condition of general shear failure, evaluate the

contribution of the following to the ultimate bearing capacity, in kPa:

The ground water table is at a level that does not affect the unit weight of the soil. Use

Terzaghi's bearing capacity factors.

Cohesion strength

a$.162\mathrm{.}70$kPa

b$.216\mathrm{.}70$kPa

c$.261\mathrm{.}70$kPa

d$.116\mathrm{.}70$kPa

Soil overburden

a$.178\mathrm{.}56$kPa

b$.187\mathrm{.}65$kPa

C$.215\mathrm{.}46$kPa

d$.251.$kPa