Mass Effect Quasar

@wins = 0
@losses = 0

def add_one_to_eight(current)
    current + rand(1..8)
end

def add_four_to_seven(current)
    current + rand(4..7)
end

def payout(num)
    payout = case num
    when 20
        400
    when 19
        300
    when 18
        250
    when 17
        200
    when 16
        100
    when 15
         50
    end
    @profit = @profit + payout
    @wins = @wins + 1
end

def play
    @profit = @profit - 200
    current = rand(1..5)
    do_turn(current)
end

def do_turn(current)
    if [1,2,6,7,8,13,14,15].include?(current)
        current = add_four_to_seven(current)
        do_turn(current)
    elsif [3,4,5,9,10,11,12,16].include?(current)
        current = add_one_to_eight(current)
        do_turn(current)
    elsif [17,18,19,20].include?(current)
        payout(current)
    else
        @losses = @losses + 1
    end
end

def begin_quasar
    @profit = 0
    games = 1000 # number of games to simulate
    i = 0

    while i < games
        puts i
        play
        i = i + 1
    end

    puts "\n Final profit: " + @profit.to_s
    puts " Wins:   " + @wins.to_s + " " + ((@wins.to_f/games.to_f) * 100.to_f).floor.to_s + "%"
    puts " losses: " + @losses.to_s + " " + ((@losses.to_f/games.to_f) * 100.to_f).floor.to_s + "%"
end

begin_quasar