Include the cost of tuition as well as living expenses. Usually these will be higher than planned so they will be balanced by your internship income.
You can include your expected annual salary + expected bonus. For an MBA position, you can usually expect a 20% annual performance bonus.
We recommend assuming Cost of Living is 30-60%, Savings is 15%, and Other Expenses is 15%. If you are unsure, use 10-40% depending on how expensive it is in your desired work location.
This is what you will end up paying towards the loan each month; this is NOT the minimal payment; that will depend on the loan term which is usually 10, 15, or 20 years.