My data came from the LSAC.
The difference is that LSAC only gives you a range, whereas I give you the exact calculation. You can try it and verify that my calculations are correct.
I only wanted ot provide this because the difference between 40% and 60% is quite significant, but the LSAC lumps them in the same range.
You can also use my site, vary the LSAT and GPA, and see how much the school of your choice values LSAT vs. GPA.