How do you set percentage in Google Visualization Chart API?

Question

How do you set the vertical axis to display percent such as 25%, 50%, 75%, 100%?

Answer 1

var options = {
        title: 'Chart Title',
        vAxis: {
            minValue: 0,
            maxValue: 100,
            format: '#\'%\''
        } 
    };

Try escaping the % sign. I've used this to just append the % sign in the y axis.