Two people jointly opened a photography studio, and the dividend problem needs to be solved? thank you

This is very simple. Everyone has invested the same amount of money, so the bonus should be distributed in proportion to their contribution. As for your friends, they may have to share more in their work. You can give them a monthly salary in the form of employment. This should be written in the agreement. Personally, I suggest drafting a partnership agreement and settling accounts with your brothers.