Given that the person earning $500,000 had a lower tax removed from them on the first $106,800 they earned, the amount saved if this portion was:
2/100*106,800
=$2136
amount received on federal tax return was $14,250
Total amount saved from taxes was:
14250+2136
=$16,386
this is equivalent to 16,386/500000=0.032772~3.28%
hence the answer is:
A person earning $500,000 a year received $16,386 more or 3.28% more of their income.