please answer parts a and b

The Elgin State Bank has the simplified balance sheet below. Assets Liabilities Required reserves $5,000 Demand deposits $20,000 Excess reserves $0 Owner's equity $10,000 Customer loans $15,000 ernment securities (bonds) $7,000 Building and fixtures $3,000 b) Suppose that the Federal Reserve purchases $10,000 worth of bonds from Elgin State Bank. What will be the change in the dollar value of each of the following immediately after the purchase? Excess reserves a. b. Demand deposit