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A shallow foundation $25$m $18$ m carries a uniform pressure of $175$ kPa. Determine the vertical stress at two points that are $12$ m and $24$ m below the mid$-$point of one of the long sides, respectively. $($a$)$ using influencing factors $($b$)$ by means of Newmark$$s chart $($c$)$ using the $2$:$1$ method $($c$)$ Comment on the results of the $2$:$1$ method by comparing with those of the other two methods. A shallow foundation $\backslash (25\backslash$mathrm$\{$~m$\}\backslash$times $18\backslash$mathrm$\{$~m$\}\backslash )$ carries a uniform pressure of $175$ kPa $.$ Determine the vertical stress at two points that are $12$ m and $24$ m below the mid$-$point of one of the long sides, respectively.

$($a$)$ using influencing factors

$($b$)$ by means of Newmark's chart

$($c$)$ using the $2$:$1$ method

$($c$)$ Comment on the results of the $2$:$1$ method by comparing with those of the other two methods.