class ActiveSupport::NumberHelper::NumberToCurrencyConverter

def convert
  number = self.number.to_s.strip
  format = options[:format]
  if number.to_f.negative?
    format = options[:negative_format]
    number = absolute_value(number)
  end
  rounded_number = NumberToRoundedConverter.convert(number, options)
  format.gsub("%n", rounded_number).gsub("%u", options[:unit])
end