As of 4pm on Tuesday the 24th of November 2009:
1 USD = 47.10 PHPA
Therefore:
50,000 USD = 2,355,000 PHP.
However the value of differing currencies fluctuates so this will vary over time and...
Approximately 47 Philippines pesos equals to 1 United States Dollar.
However, exchange rates change every day so please check a site such as www.xe.com, CNNMoney, etc. for the latest conversion...