How do I turn a double into a percentage in Java?

I have a double called average. If its output is 0.8266666531562805 how do I format it to display as 82.67%

Current line:

System.out.println("Your score is: " + average);

>Solution :

DecimalFormat df = new DecimalFormat("#.##%");
df.format(0.8266666531562805);