If it is the old 5000 Peso then about $.05.
the value changed around 1996
CorrectionThere's no such thing as a "peso dollar". Mexico uses the "$" symbol to mean pesos, so even though it's the same as the U.S. dollar sign it means something completely different.
Exchange rates change every day so any answer posted here would be out of date within 24 hours. While it's not normal WikiAnswers policy to say "use the internet", that's the best approach in this case. You can check a site such as www.xe.com, CNNMoney, etc. for the latest conversion factors.