First National Bank of Bannerville has posted interest revenues of $63 million and interest costs from all

Question:

First National Bank of Bannerville has posted interest revenues of $63 million and interest costs from all of its borrowings of $42 million. If this bank possesses $700 million in total earning assets, what is First National’s net interest margin? Suppose the bank’s interest revenues and interest costs double, while its earning assets increase by 50 percent. What will happen to its net interest margin?