GoldMine

using System;

namespace GoldMine
{
    class Program
    {
        static void Main(string[] args)
        {
            int locations = int.Parse(Console.ReadLine());

            for (int i = 0; i < locations; i++)
            {
                double expectedYield = double.Parse(Console.ReadLine());
                int days = int.Parse(Console.ReadLine());
                double locationYield = 0;
                for (int j = 0; j < days; j++)
                {
                    double goldYield = double.Parse(Console.ReadLine());
                    locationYield += goldYield;
                }
                double averageYield = locationYield / days;
                if(expectedYield > averageYield)
                {
                    Console.WriteLine($"You need {expectedYield - averageYield:f2} gold.");
                }
                else
                {
                    Console.WriteLine($"Good job! Average gold per day: {averageYield:f2}.");
                }
            }
        }
    }
}