text: var Chainable = function () {
      this.nNumber = 0;
  };
  Chainable.prototype.add = function (nNumber) {
  	this.nNumber += nNumber;
  	return this;
  };
  Chainable.prototype.multiply = function (nNumber) {
  	this.nNumber *= nNumber;
  	return this;
  };
  Chainable.prototype.toString = function()
  {
  	return this.nNumber.toString();
  };