If anyone don't understand this basic thing such as budgeting then they should not be in business or have anything to do with finance. OP you did a good job but have honestly post like this are basic, this type of post will have a good fitting for beginners and help. This is a vast forum and the economy board of the forum talking about very basic thing like this that is obvious as day light is a bit cringe.
Budgeting is part of our everyday life and for one to be successful there's always a reason for budget , there's a saying that failing to plan is planning to fail ,so to business owners and individually budget keeps you on track .