Answer:
Marginal tax rate
Step-by-step explanation:
Marginal tax rate is the rate of tax that is assessed on an additional increment of income. Since MaryBeth has a contract job but wants to take on more, she has to consider what her after marginal tax rate profit will be as the additional job will is bringing in additional increment in income.
To calculate marginal tax, MaryBeth has to find the tax rate on the additional income from and find its percentage in the differnece between the incomes.
Cheers.