If you don't expect any significant change in your usage patterns, then you can get a general idea (understand that the calculation will not be exact) of what your maximum deposit would be by adding up your most recent 12 bills and multiplying the sum by 21%. As an example, if the sum of the bills you added up equaled to $1300.00, your maximum deposit would be $273.00 ($1300 X .21 = $273). Or, ...
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