Define a function find$\_$user$\_$tax$()$ that takes one parameter as a person's age, and returns the person's tax percent. The tax percent is returned as follows:

If the person's age is $20$ or less years old, then the tax percent is $0\mathrm{.}33.$

If the person's age is more than $20$ and less than $60$ years old, then the tax percent is $0\mathrm{.}25.$

Otherwise, the tax percent is $0\mathrm{.}11.$