New Twiddle

models.price.js

import DS from 'ember-data';

export default DS.Model.extend({
  costCents: DS.attr('number'),
  cost:Ember.computed('costCents',{
  	get(key){
      return this.get('costCents')/100
    },
  	set(key,value){
    	this.set('costCents',value*100)
  	}})
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model()
  {return this.get('store').createRecord('price',{costCents: 20});}
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<div>
{{input type='text' value= model.cost }}
</div>
<div>

{{model.costCents}}
</div>
<br>
<br> 

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "2.14.1",
    "ember-template-compiler": "2.14.1",
    "ember-testing": "2.14.1"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}