In a meter bridge experiment null point is obtained at 20 cm from one end of the wire when resistance $X$ is balanced against another resistance Y. If $X < Y$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4$X$ against $Y$?

Question

$\begin {array} {1 1} (A)\;50\: cm & \quad (B)\;80\: cm \\ (C)\;40\: cm & \quad (D)\;70\: cm \end {array}$