Question

A single person pays $6,600 in income taxes on a gross income of $33,000. How much would a single person be expected to pay if his gross income is $36,000?

Answer 1

Write and solve an equation of ratios:

$33,000 $6,600

------------- = -------------

$36,000 x

Then 33000x = 237600000, resulting in x = $7,200 (answer)