There's no really interest for this..you just get the total amount of whatever you've put in..although I've joined one paluwagan in my previous work were we allow someone (even outside the members of the list) to borrow from our money pot and put interest on the borrowed money..so in the end we gained extra money more than we've put in total..there are different ways to do this paluwagan..it's up to the group members how they would gain from this.