Relmor....
I am not saying you don't understand this, because I would have no way to know. However, the point you brought up may be something others need clarity about.
Synergies are oft discussed in NPV (Net Present Value)
Net present value (NPV) is defined as the total present value (PV) of a time series of cash flows. It is a standard method for using the time value of money to appraise long-term projects. Used for capital budgeting, and widely throughout economics, it measures the excess or shortfall of cash flows, in present value terms, once financing charges are met.
An example is the Bear Sterns report that discussed synergies and establishing a net present value.
http://siriusbuzz.com/bear-stearns-issues-note.php
Janco is also using the time value of money in their call
http://siriusbuzz.com/janco-upgrades...-synergies.php
I hope this clarifies where the merger synergy nbnumbers come from