I can't get the numbers you have stated in this thread, for example let's take the first issue of PPT.A bond:
Number of bonds issued 1500, total income from this sale 1608.81947502 (average price was 1608.81947502/1500=1.07254631668)
Then estimated profit has to be (1608.81947502-1500)*1.28=139.2889280256, or if you take compounding interest rate for 27 days and 22 hours then profit becomes 184.1682183.
So I don't get the value as you stated 142.89848614
![Huh](https://bitcointalk.org/Smileys/default/huh.gif)
Edit: Also You sold PPT.C for higher average price than PPT.B, but estimated income was lower for PPT.C.