Define a method findUserTax$()$ that takes one integer parameter as a person's age, and returns the person's tax percent as a double. The tax percent is returned as follows:

If the person's age is at least $80$ years old, then the tax percent is $0\mathrm{.}17.$

If the person's age is at least $20$ and less than $80$ years old, then the tax percent is $0\mathrm{.}22.$

Otherwise, the tax percent is $0\mathrm{.}34.$

Ex: If the input is $85,$ then the output is:

$0\mathrm{.}17$