The main determinant is the demand for that currency.
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Because the value of each currency is based on their economic strength. Currency is traded between countries - and one currency may be in more demand (increasing its value) than another.
its place value
Trading of foreign monies are being done continually. Currency conversions are done by exchanging two different forms of money. One value of currency is traded for the current value of the other currency.
Foreign currency is calculated using the average market value of the currency over a 24 hour period and then comparing that value to other currencies. This is why exchange rates can vary from day to day.
It is 1 peso! And if you wanted to know its value in some other currency then you need to specify which country's peseta you are talking about and also in which country's currency you want its value.