top rater=0 kgs or 1 =100 > .5 kg =.90 or 90% > 1kg =.80 or 80% > 1.5 kgs =.67 or 67% > 2 kgs =.57 or 57% > 2.5 kgs =.50 or 50% > 3 kgs =.40 or 40% >3.5 kgs =.33 or 33% > 4 kgs =.25 or 25%. Scott said to price down to 3.5 kgs inclusive.So if you have 5 horses say t/r=0/1-/1kg=.80-/1.5kg=.67-/2.5=.50-/3.5kgs=.40.Add 1+.8+.67+.50+.40=[3.37]divide 1/3.37 or 100/3.37=29.67 then 100/29.67=$3.37 or 3.40[100%]then do the same with other rated horses.