06. Gold Mine

num_location = int(input())

average_gold_for_day = 0
total_gold = 0

for location in range(1,num_location + 1):
    average_gold_about_day = float(input())
    num_days_in_that_location = int(input())
    average_gold_for_day = 0

    for day in range(1,num_days_in_that_location + 1):
        gold_for_day = float(input())
        average_gold_for_day += gold_for_day

    total_gold = average_gold_for_day / day

    if total_gold >= average_gold_about_day:
        print(f"Good job! Average gold per day: {total_gold:.2f}.")
    else:
        print(f"You need {abs(average_gold_about_day - total_gold):.2f} gold.")