Your balance: $ 100 000.00
              € 70 000.00
              3 000 000,00 руб.

number_to_currency(70000.00, :unit => "€", :separator => ".", :delimiter => " ", :format => "%u %n")

defaults  = I18n.translate('number.format''number.format', :locale => options[:locale], :raise => true) rescue {}
currency  = I18n.translate('number.currency.format''number.currency.format', :locale => options[:locale], :raise => true) rescue {}

number_to_currency(70000.00, :locale => :ru)