Read the Article. The percentages given are of DISCRETIONARY FUNDS, not total income.
Example Math and the percentages from above:
Make 50k, 40k is necessary, 10K is Discretionary, $760 charity
Equals 1.52% of total income
Make 100k, 40k is necessary, 60k is Discretionary, $2520 charity
Equals 2.52% of total inco...more