That is calculating it at Friday' rate for both stocks. The actual ratio won't be known until a date certain is posted. That will be the date the value of both company's stock price is used for the calculation of the stock transfer.
If the price of CGFIA goes up, and the price of AMNP goes down, then the ratio will change and vise-versa, along with all the other combinations of possibilities (7 different scenarios).
A lot COULD happen before an "unknown" date. Calculating it now is just a WAG, with a lot of speculation mixed in.
Don't take my word for it, Do your own research! Then you will know it's true!