A $2 m \times 4 m$ rectangular footing has to carry a uniformly distributed load of $120 \mathrm{kPa}$. As per the 2: 1 dispersion method of stress distribution, the increment in vertical stress (in $k P a$ ) at a depth of $2 \mathrm{~m}$ below the footing is

A $2 m \times 4 m$ rectangular footing has to carry a uniformly distributed load of $120 \mathrm{kPa}$. As per the 2: 1 dispersion method of stress distribution, the increment in vertical stress (in $k P a$ ) at a depth of $2 \mathrm{~m}$ below the footing is

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