or
20 20 23 23 22 22 24 24 27 27 28 28 21 21 24 24 20 20 24 24 26 26 24 24 26 26 22 22 20 20 23 23 25 25 24 24 21 21 20 20 22 22 20 20 28 28 25 25 22 22 20 21 22 23 24 25 26 27 28 29 2 4 6 8 10 12 10% 20% 30% 40% 50%