If you’re not sure how much money to set aside, I suggest using the practical 50–20–30 rule, which calls for categorizing spending and allocating 50% of your income on needs, 30% on wants and activities, and 20% on bettering your financial future (like investing).
5 Things You Should Do for 5 Minutes Every Day to Be Exceptionally Successful
Elle Kaplan

Yes, was looking something mathematical like that. Is this useful or experienced by someone?

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