Breakdown Component

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle'
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{breakdown-calculator}}
<br>
<br>

breakdown-calculator.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  totalCalories: 200,
  fatPercentage: Ember.computed('totalCalories', 'fatGrams', {
    get() {
  		return (this.get('fatGrams') * 9) / this.get('totalCalories');
  	},
    set(key, value) {
      this.set('fatGrams', (this.get('totalCalories') * value) / 9);
    }
  }),
  
  fatGrams: 0,
});

breakdown-calculator.template.hbs

<p>Total calories: {{input value=totalCalories}}</p>
<p>Fat Grams: {{input value=fatGrams}}</p>
<p>Fat Percentage: {{input value=fatPercentage}}</p>

twiddle.json

{
  "version": "0.4.17",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}