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system
weekly budgets based on (a variable) monthly budget
user
if you know, approximately, the minimum he would get in a month, his budget should be planned based on this amount. in months where he gets more than this, the excess should be put aside. in really bad months where the income drops below the expected minimum, he can use the money put aside. after a year of putting money aside, he can plan to use and budget this for any other expenses.
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