The radii and Young's moduli of two uniform wires $\mathrm{A}$ and $\mathrm{B}$ are in the ratio $2:1$ and $1:2$ respectively. Both wires are subjected to the same longitudinal force. If the increase in the length of the wire $\mathrm{A}$ is one per cent, the percentage increase in the length of the wire $\mathrm{B}$ is