Using the relative damage $u_f$ formula below and the table data determine effective roadbed soil resilient modulus.

$u_f=1\mathrm{.}18{10}^8{M}_R^{-2\mathrm{.}32}$

$\backslash$table$[[$Month$,\backslash$table$[[$Roadbed$],[$Soil Mr$,],[$psi$]]],[$Jan$,50000],[$Feb$,50000],[$Mar$,50000],[$Apr$,12000],[$May$,12000],[$Jun$,12000],[$Jul$,25000],[$Aug$,25000],[$Sep$,25000],[$Oct$,32000],[$Nov$,32000],[$Dec$,32000]]$