Various masaail of the Musjid

Q: I have a savings account with a bank and want to know what I should do with the interest that the bank pays me. I do not want to use it as it is haraam. Should I donate this money to my local Musjid?

Q: Is it permissible to make general announcements on the azan mic which is in the musjid eg. janazah?

Q: Is it jaaiz to make an announcement in Ramadhan for a collection for huffaaz?

Q: A jamaat khana and a Musjid are nearby but the jamaat khana is nearer to where I work. Will it be more virtuous to read salaat in the jamaat khana or Musjid?

Q: Is it more rewarding to perform Salaah in a Musjid or a Jamaat Khaana?

Q: Are cctv's allowed to be installed in the masaajid?