Final answer:
The tax Bill would pay if his income is $100 and his marginal tax rate is 40% is $40. None of the given options are correct.
Step-by-step explanation:
Assuming that Bill's marginal tax rate is 40%, to calculate the amount of tax he would pay on an income of $100, we simply apply the marginal tax rate to the income. Therefore, Bill's tax payment would be 40% of $100, which is calculated as 0.40 × $100 = $40.
However, the options given do not include $40, hence the correct answer to the question is 5) None of the Above.