The amount of extension in an eleastic spring varies directly as the weight hung on it. If a weight of $150\;g$ produces an extension of $2-9\; cm$ then what weight would produce an extensiion of $17.4$ cm

Question

$\begin{array}{1 1} 800\;g \\ 900\;g \\ 600\;g \\ 700\;g \end{array}$