If a person has an income of $100,000, what percent of his income does he pay in federal income tax if the tax rate is as given below?
15% of the first $30,000
of income,
28% of the next $30,000
of income, and
31% of all income in excess
of $60,000.

Explanation:

1. Calculate the tax

15 % of first $30 000  =  0.15 × 30 000 = $  4 500

28 % of next $30 000 = 0.28 × 30 000 =     8 400

31 % of next $40 000 =  0.31 × 40 000 =   12 400

                                                          Tax = $25 300

2. Calculate the tax percentage

not b. i am not sure what it is but not b