A sample of people were asked their opinion on making voting voluntary in Australia, and their age group. The following table shows the results from this survey.

	For	Against	Unsure
18 to 30 years	24	39	30
31 to 50 years	21	38	28
Above 50 years	28	17	38

What is the probability that a person randomly selected is for voluntary voting and is above 50 years of age?

Please provide your answer in decimal form or percentage form, correctly rounded to two decimal places.