def lin_rodnitsky_ratio(avg_cost_per_conversion_all_queries,
                        avg_cost_per_conversion_queries_with_one_conversion_or_more):
    """Return the Lin-Rodnitsky Ratio describing the quality of paid search account managemnent.

    Args:
        avg_cost_per_conversion_all_queries (float): Average cost per conversion on the whole PPC account.
        avg_cost_per_conversion_queries_with_one_conversion_or_more (float): Average cost per conversion for only
        conversions where there was one or more conversions.

    Returns:
        Lin-Rodnitsky Ratio (float).

        1.0 to 1.5 - Account is too conservatively managed.
        1.5 to 2.0 - Account is well-managed.
        2.0 to 2.5 - Account is too aggressively managed.
        2.5 or more - Account is being mismanaged.
    """

    return avg_cost_per_conversion_all_queries / avg_cost_per_conversion_queries_with_one_conversion_or_more