# File lib/action_view/helpers/number_helper.rb, line 162
      def number_to_percentage(number, options = {})
        return nil if number.nil?

        options.symbolize_keys!

        defaults   = I18n.translate('number.format''number.format', :locale => options[:locale], :default => {})
        percentage = I18n.translate('number.percentage.format''number.percentage.format', :locale => options[:locale], :default => {})
        defaults  = defaults.merge(percentage)

        options = options.reverse_merge(defaults)

        begin
          "#{number_with_precision(number, options.merge(:raise => true))}%".html_safe
        rescue InvalidNumberError => e
          if options[:raise]
            raise
          else
            e.number.to_s.html_safe? ? "#{e.number}%".html_safe : "#{e.number}%"
          end
        end
      end