For each of the following, explain whether the rate structure is progressive, proportional, or…

For each of the following, explain whether the rate
structure is progressive, proportional, or regressive:

a. Plymouth County imposes a 5% tax on all retail sales in
the county. Taxpayers with incomes less than $12,000 receive a refund of the
tax they pay.

b. The country of Zambonia imposes a 10%tax on the taxable
income of all individuals.

c. Regan County imposes a property tax using the following
schedule:

d. The city of Thomasville bases its dog licensing fee on
the weight of the dog per the following schedule: