What is a bank’s net interest margin?

1. What is a T-account? Use a T-account to show the effect on Bank of America’s balance sheet of your depositing $50 in currency in your checking account.
2. What is a bank’s net interest margin? How is it related to a bank’s return on assets (ROA)?
3. What is the difference between a bank’s return on assets (ROA) and its return on equity (ROE)? How are they related?