One end of a wire of length $2L$ and cross-sectional area $A$ is attached to an end of another wire of length $L$ and cross-sectional area $2A$. If the free end of the longer wire is at an electric potential of $8.0$ volts, and the free end of the shorter wire is at an electric potential of $1.0$ volt, the potential at the junction of the two wires is most nearly equal to?