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        /// <summary>
        /// https://groophy-inc.github.io/root
        /// percent      - 100
        /// per_mille    - 1000
        /// per_million  - 1000000
        /// per_billion  - 1000000000
        /// per_trillion - 1000000000000
        /// </summary>
        public enum pers
        {
            percent,
            per_mille,
            per_million,
            per_billion,
            per_trillion
        }

        /// <summary>
        /// https://groophy-inc.github.io/per
        /// </summary>
        /// <param name="value"></param>
        /// <param name="p"></param>
        /// <returns></returns>
        public static GValue per(GValue value, pers p)
        {
            switch (p)
            {
                case pers.percent:
                    return Math.Division(value, new GValue("1"));
                    break;
                case pers.per_mille:
                    return Math.Division(value, new GValue("10"));
                    break;
                case pers.per_million:
                    return Math.Division(value, new GValue("10000"));
                    break;
                case pers.per_billion:
                    return Math.Division(value, new GValue("10000000"));
                    break;
                case pers.per_trillion:
                    return Math.Division(value, new GValue("10000000000"));
                    break;
            }
            return new GValue("0");
        }