using System;

public class Program

{

    private static float[] GetFishingChances(float multiplier)

    {

            var mediumModifier = 100f;

            var largeModifier = 10f;

            float[] result = new float[3]

            {

                60 - 30 * multiplier,

                30 + 20 * multiplier,

                10 + 10 * multiplier

            };

            /*

            if (mediumModifier > 0f)

            {

                var newChance = result[1] * (1 + mediumModifier / 100f);

                var diffs = newChance - result[1];

                var sum = 0f;

                for (int i = 0; i < 1; i++) sum += result[i];

                for (int i = 0; i < 1; i++)

                {

                    result[i] = result[i] * (1 - diffs / sum);

                }

                result[1] = newChance;

            }

            */

            void applyModifier(int idx, float modifier)

            {

                var newValue = result[idx] * (1f + modifier / 100f);

                var diff = newValue - result[idx];

                var sum = 100f - newValue;

                for (int i = 0; i < idx; i++) result[i] = result[i] * (1 - diff / sum);

                result[idx] = newValue;

            }

​

            if (mediumModifier > 0f) applyModifier(1, mediumModifier);

            if (largeModifier > 0f) applyModifier(2, largeModifier);

​

            return result;

    }

    public static void Main()

    {

        var chances = GetFishingChances(0f);

        Console.WriteLine(chances[0]);

        Console.WriteLine(chances[1]);

        Console.WriteLine(chances[2]);

    }

}