Final answer:
Mary Ann would not be able to save 10% of her monthly after-tax income due to her expenses being greater than 10% of her income.
Step-by-step explanation:
Mary Ann's monthly after-tax income is $2,589.10 and she wants to save 10% of her income. Her monthly expenses include rent ($790), cell phone ($75), utilities ($45), cable TV and internet ($65), groceries ($450), entertainment ($250), car payment ($350), and gasoline ($120). To determine if she can save 10% of her income, we calculate the total amount of her expenses, which is $2,145. Then, we find 10% of her income, which is $258.91. Since her expenses are greater than 10% of her income, she would not be able to save 10% of her after-tax monthly income.