code: function (number, model) {
      var args = [].slice.call(arguments, 1);
      args.unshift(number * this.multiplier);
      return (NumberFormatter.prototype.fromRaw.apply(this, args) || "0") + this.symbol;
    }
docs: Takes a floating point number, where the number is first multiplied by
  `multiplier`, then converted to a formatted string like
  NumberFormatter#fromRaw, then finally append `symbol` to the end.
  
  @member Backgrid.PercentFormatter
  @param {number} rawValue
  @param {Backbone.Model} model Used for more complicated formatting
  @return {string}