Sarah is paying off a student loan at the rate of $900 per year. Fixed expenses:

Incomplete question. I inferred you want explanations about what are fixed expenses.

Explanation:

In accounting, the term fixed expenses apply to expenses that do not change for a considerable period of time. In other words, these expenses are fixed in nature. These expenses for example may include; rent payments,  mortgage payments,  insurance payments,  and utility expenses (electricity bills and phone bills, etc).

b

step-by-step explanation: