I'm working a problem, attempting to find a income tax rate that will change depending on the gross paycheck amount. Some data points:
$800 gross = 11% taxed
$1500 gross = 16% taxed
$2000 gross = 20% taxed
How would I go about finding the relationship between the gross paycheck amount and the percentage taxed? Beyond that as well, how will I then be able to apply that relationship mathematically in order to obtain other data points (\$1000 gross paycheck, $500, etc...) and get an accurate tax percentage for them as well? I have a feeling it'll be an answer lying somewhere in the statistics field, but I'm no math expert.