8-13-2012 Dalite (Dinar Vets): "CBI says that the increase in its reserves of hard currency to 67 billion dollars, gives the dinar extra strength." At 1.3 the reserves necessary to back the exchange rate, they are saying they have 130% of what is needed to back the Dinar in circulation.
That said, the amount in circulation should be 30% less than what 67 billion USD can back, so your 50 trillion estimate should be in the ball park. Unfortunately, I don't have a calculator that can handle figures that large.
Also, at 130% of what is needed to back the exchange, they can afford a 30% increase in the exchange rate and still back the currency 100%. This is probably the number to keep an eye on. The Foreign Reserves will continue to increase, and as long as they do not increase printing of the dinar, the potential for improving the exchange rate increases in proportion.
Since 2006, they have gone from 0 to 67 billion USD. They can definately increase the exchange rate; just not as much as the Pumpers promise (daily) - unless they thumb their nose at the IMF and other debt holders and choose to back at less than the required 100%. Many are suggesting that they will burn their bridges and take that choice.