title: How to add axis ticks/labels in google column chart?
body: <p>I've been trying to add ticks/labels to the following google chart's vertical axis. I want the left-hand axis to show 0-100% with ticks every 20%, but nothing I've tried has worked. </p>
  
  <p>I've tried copying the same approach I see in google's provided jsfiddles, but I can never translate the behavior to my own chart.</p>
  
  <p>Here is the code for my chart without the labels:</p>
  
  <pre><code>// Load the Visualization API and the corechart package.
  google.charts.load('current', {
    'packages': ['bar']
  });
  
  // Set a callback to run when the Google Visualization API is loaded.
  google.charts.setOnLoadCallback(drawChart);
  
  function drawChart() {
    var data = new google.visualization.arrayToDataTable([
      ['Problems', 'One', 'Another', 'Yet another'],
      ['Easier problems', 79, 45, 25],
      ['Harder problems', 64, 20, 9],
    ]);
  
    var options = {
      chart: {
        title: 'Navy Troubleshooting Competition',
        subtitle: '% solved',
        'backgroundColor': {
          fill: 'transparent'
        },
      }
    };
  
    var chart = new google.charts.Bar(document.getElementById('dual_y_div'));
    chart.draw(data, google.charts.Bar.convertOptions(options));
  }
  </code></pre>
  
  <p><a href="https://jsfiddle.net/01r0rqnb/2/" rel="nofollow">Here it is in jsfiddle form.</a></p>
  
  <p>Everything I've tried has provided exactly zero visible effect, so I've left off my failed attempts; apologies if this comes off as a lack of completeness on my part.</p>
  
  <p>Any help would be <em>greatly</em> appreciated. Thank you for your time.</p>