Calculate elongation if $l_{steel}=2m$ and $l_{brass}=1.5m$,$a_{steel}=2mm^2$ and $a_{brass}=5mm^2$,$Y_{steel}=2\times 10^{11}N/m^2$ and $Y_{brass}=1\times 10^{11}N/m^2$.

Question

$\begin{array}{1 1}(A)\;.28mm\\(B)\;.33mm\\(C)\;.24mm\\(D)\;\text{None}\end{array}$