Q:

How the Bounty Rules Applied

Here it is mentioned that Users must have at least 75 reputation to offer a bounty but I have saw a question with the bounty of 50 whose reputation point is 34. I wonder how he could able to start a bounty?

A:

Placing a bounty immediately subtracts that score from your reputation (not when it is awarded) - essentially those points are in escrow, pending an accepted answer. So the user's reputation was by necessity sufficient at the time they placed the bounty.

