Tinnitus, Permanent, Profound Hearing Loss

Could someone help me answer and clarify the Tinnitus questions / situation described below?

1) How common is that for a person who suffer Tinnitus to have
a permanent and profound hearing loss in both ears, with an
auditory threshold of more than 90 decibels?

or

2) From all those who are suffering from Tinnitus, how many percent
have the problem of permanent and profound hearing loss in both
ears, with an auditory threshold of more than 90 decibels?


3) What are the available cures or therapy for a person who suffers
the permanent and profound hearing loss in both ears, with an
auditory threshold of more than 90 decibels?