In problem 6-10, what was the individual’s marginal state income tax rate in 2021? Did this individual experience proportional, progressive, or regressive taxation? Explain briefly.

Data From Problem 10

Between 2020 and 2021, a small business owner’s income increased from $200,000 to $220,000. The annual state income taxes that she paid increased from $5,000 to $5,500. What was her average state income tax rate in each year?