3. Suppose you are friends with a married couple with a taxable income of $78,000/year, which puts them (for 2021) in the tax bracket with a marginal tax rate of 12%.

Table 1. Tax Brackets and Rates, 2021 For Married Individuals For Heads of Rate For Unmarried Individuals Filing Joint Returns Households 105 $0 to $8 950 SO to $19,800 $0 to $14.200 120 19.951 to $40,525 $19,901 to $81,050 $14,201 to $54,200 $40 526 to $86 375 381 051 16 $172.750 $54 201 10 $86 350 24% 106,376 to $164,925 $172,751 to $320.050 106,351 to $164,900 32% $164,926 to 3209,425 5329,051 to $410,050 $164,901 to $209,400 $208,426 to $523,600 5418,851 to 5626,300 $208,401 10 $523,600 379% $523,601 or more 8620,301 or more 1523,801 or more