Why does George Baker keep a detailed list of monthly expenses and income?

To regulate his spending and spend money according to budget.

Explanation:

A detailed list of monthly expenses and income constitutes a budget. A budget, simply put, controls how money flows and how it should be spent. It also determines how money is saved. In a nutshell, the budget is a responsible way of spending money while saving for the future. A typical equation for savings is like this:

it would just be he's just so filthy.

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