The specifications for a manifold gasket that installs between two engine parts calls for a thickness of $2\mathrm{.}500$ mm $\backslash$pm $\mathrm{.}020$ mm$.$ The standard deviation of the process is estimated to be $0\mathrm{.}004$ mm$.$ The process is currently operating at a mean thickness of $2\mathrm{.}50$ mm$.$ What is the lower specification limit for this product in mm$?$ give answer in $2$ dp$.$