I'm pretty sure it was 85.7 rather than 100.
We were given values e.g.:
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
As the values for 0.0 and 0.7 were the same I think people are confused as if the cycle lasted 0.6 or 0.7 seconds. If you plotted the movement off the graph, and worked out the beats per minute, you would take the points on the graph that were the SAME (not the point just before), therefore you use 0.7 value. I hope that makes sense..