Assume the U.S. has only four citizens, who earned the following income (all taxable) for 2020: Citizen A = $12,000 Citizen B = $25,000 Citizen C = $50,000 Citizen D = $100,000 The citizens have decided that they need $30,000 of tax revenue to provide public services. How could this tax burden be split amongst the citizens? Following the work process agreed upon in your team charter, discuss your proposed divisions and whether they are examples of flat, progressive, or regressive tax structures and the concept of fairness.