.... "There is now."

The original is called "Answer", and it's by Frederic Brown, and has an even better punchline. I believe, but cannot prove, that it was first published in 1954; my copy of Space Opera (ed Brian Aldiss) lacks that, erm, datum.

.... "INSUFFICIENT DATA" [caps in original):

"The Last Question" (Isaac Asimov), copyrighted by him 1956.

.... "there is no new thing under the sun":

Ecclesiastes 1, verse 9. Usually attributed to The Preacher.