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 google.charts.load('current', 'packages':['corechart', 'bar']);
 google.charts.setOnLoadCallback(drawStuff);

 function drawStuff() 

 var button = document.getElementById('change-chart');
 var chartDiv = document.getElementById('chart_div');

 var data = google.visualization.arrayToDataTable([
 ['Type', 'Ontime%', 'Count', 'Ontime% Goal'],
 ['AE', 90, 500, 100]
 
 ]);

 var classicOptions = 
 width: 900,
 series: 
 0: targetAxisIndex: 0, type: 'bars',
 1: targetAxisIndex: 1, type: 'bars', 
 2: targetAxisIndex: 0, type: 'line', pointSize: 8, pointShape: type: 'circle' , 
 ,
 title: 'Ontime % on the left, Count on the right',
 bar:
 width: "60%"
 ,
 vAxis: 
 	minValue: 0
 ,
 vAxes: 
 // Adds titles to each axis.
 0: title: 'Ontime %',
 1: title: 'Count'
 
 ;

 function drawClassicChart() 
 var classicChart = new google.visualization.ColumnChart(chartDiv);
 classicChart.draw(data, classicOptions);
 button.innerText = 'Change to Material';
 button.onclick = drawMaterialChart;
 

 drawClassicChart();
 ;

<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
 <br><br>
 <div id="chart_div" style="width: 800px; height: 500px;"></div>

google.charts.load('current', 
 packages: ['corechart']
).then(function () 
 //var button = document.getElementById('change-chart');
 var chartDiv = document.getElementById('chart_div');

 var data = google.visualization.arrayToDataTable([
 ['Type', 'Ontime%', 'Count', 'Ontime% Goal'],
 ['AE', 90, 500, 100]
 ]);

 var classicOptions = 
 width: 900,
 series: 
 0: targetAxisIndex: 0, type: 'bars',
 1: targetAxisIndex: 1, type: 'bars',
 2: 
 targetAxisIndex: 0,
 type: 'line',
 pointSize: 8,
 pointShape: type: 'circle',
 ,
 ,
 title: 'Ontime % on the left, Count on the right',
 bar:
 width: "60%"
 ,
 vAxis: 
 minValue: 0
 ,
 vAxes: 
 0: title: 'Ontime %',
 1: title: 'Count'
 
 ;

 function drawClassicChart() 
 var classicChart = new google.visualization.ColumnChart(chartDiv);
 google.visualization.events.addListener(classicChart, 'ready', function () 
 var chartLayout = classicChart.getChartLayoutInterface();
 var bounds = chartLayout.getBoundingBox('bar#0#0');
 var observer = new MutationObserver(function () 
 var circles = chartDiv.getElementsByTagName('circle');
 if (circles.length > 1) 
 circles[1].setAttribute('cx', (bounds.left + (bounds.width / 2)));
 
 );
 observer.observe(chartDiv, 
 childList: true,
 subtree: true
 );
 );
 classicChart.draw(data, classicOptions);
 //button.innerText = 'Change to Material';
 //button.onclick = drawMaterialChart;
 

 drawClassicChart();
);

<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>