See the link to - Universal Currency Converter
Use the following link to calculate: http://www.x-rates.com/d/USD/MXN/graph120.html
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The exchange rate changes many times a day. You can find the current rate of any currency by googling "foreign exchange" and clicking on one of the first sites that comes up.
as at 28 Feb 1.622USD
For every dollar, it is 0.6507 pounds.