Given a two lane $($one lane in each direction$)$ roadway with a $45$ mph travel speed, that is entering a curve with a radius of $2000$ ft$,$ design max. superelevation of $6\mathrm{.}0\%.$ If the PC Station is $28+50\mathrm{.}50$ what is the station the Tangent Runout begins?

$($enter the full station with $+$ sign, example; enter as $15+35\mathrm{.}75).$ Use survey equations.