It depends on what type of psychic you want, where you live, and whether you want an offline or online psychic. Some are famous psychics and others are not. Some psychics specialise in one area of...
You can find many psychics through the Internet by using the Google search engine. psipog.net
Take it to a collector and have him examine it and tell you the value.
It may have been filed in the county clerk's office. It could be in a safe deposit box or a safe at their home. Their attorney may also have a copy.
take the number such as 50 and multiply it by 10/100 or .10. the number left is the 10% of what you want.(ex. 50x.10=5) so in turn 10% of 50 is 5.