Calculate according to the following simplified balance sheet of a commercial bank :

(1) What is the interest rate sensitivity gap?

(2) When the interest rate on all assets is 5% and the interest rate on all liabilities is 4%, what is the profit of the bank?

(3) What is the profit of the bank after the interest rate of interest rate sensitive assets and interest rate sensitive liabilities increases by 2 percentage points?

(4) What is the relationship between the positive and negative values of interest rate sensitivity gap and the rise and fall of interest rate?