well using mr mao's calculator and going off 2007 means and s.d. (a+ cut off was 34.5)
25 SS = 12/23
26 SS = 13/26
27 SS = 14/29
28 SS = 16/32
29 SS = 17/35
30 SS = 19/38
31 SS = 21/41
32 SS = 22/44
33 SS = 24/47
34 SS = 25/50
35 SS = 27/53
36 SS = 28/56
37 SS = 30/59
38 SS = 31/62
39 SS = 32/65
40 SS = 34/67
41 SS = 35/70
42 SS = 36/72
43 SS = 37/74
44 SS = 38/76
45 SS = 39/77
46 SS = 39.5/78
47 SS+ = 40/80
second numbers are the doubled score
I think this is calculated with a constant exam 2 score and sac mark.
It also depends on what you get in those.
If people were interested, i'd encourage them to try the calculator for themselves. You know what you have gotten in SAC's and you also know what you got in exam 1 roughly.
For SAC's i'd probably use 2009 data (doesn't change heaps year to year), Exam 1 2007 data maybe, Exam 2 2007 if you think itll be hard exam or 2008/2009 if you think itll be same standard as those years.
(2008&2009 data is remarkably similar for exams, so close together)