Just to head this off at the pass (sorry i am not doing the calculation myself):
NuSafe is no longer a part of the calculation, and should essentially be ignored this week.
The buyback velocity is decreased to 5% from 10%. As a side note, his will also decrease the perceived negative standard should the buyback be negative. This will influence park rate decisions.
If the buyback amount exceeds $1000, it will be used to buy ppc.
If the buyback amount also exceeds $2500, it will also be used to buy nsr (totaling 10% used)