A mass of $2\mathrm{.}43$ kg is suspended by a thin steel wire of radius $($of cross$-$section$)$

$0\mathrm{.}339$ mm$.$ If the elastic modulus of steel is $203$ GPa calculate the strain in the

wire. Take g $=9\mathrm{.}81$ ms $-2$

$.$ Give your answer in ppm $($aka microstrain$)$ e$.$g$.$

$0\mathrm{.}000456=456$ microstrain, to nearest whole number