What exchange rate is used for paying debts in Euros today that were in the former European currencies?

A friend who has personal debts from 1992 in Italian lira, German marks, Spanish Pesetas, and Greek drachmas wants to pay his debts. But, of course now they are in Euros. What exchange rate does he use to figure the value in Euros? When the currency conversion took place, I assume each former currency had [...] http://bit.ly/qYXIOo