text: 'use strict';
  
  module.exports = function (instance, sender) {
      this.instance = instance;
      this.sender = sender;
  
      this.interestBearingPeriod = function(id) {
          return this.sender.sendto(this.instance.methods.interestBearingPeriod(id), this.address());
      }
  
      this.address = function () {
          return this.instance.options.address
      }
  }