Answer:
Create a budget by listing and totaling his income and expenses, and then subtracting his expenses from his income.
Step-by-step explanation:
If Brian wants to know the monthly payment he can afford for a cell phone plan he has to find out the amount he has left after his expenses are deducted from his earnings and this can be done by creating a budget that is a plan that shows the estimated income and expenses.
The other options are not correct because they won't help determine the money that Brian has available from his income to pay for a cell phone plan.