Answer:
Step-by-step explanation:
Calculation of the amount of required reserve as follows: 
Required Reserve = Deposit * required reserve ratio 
= $500 million * 10% 
= $50 million 
Therefore, the bank must hold $50 million in required reserve. 
It currently has $75 million in reserve so this requirement is met. 
If the bank suffers a deposit outflow of $50 million
 Assets Liabilities 
Reserves - $25 million Deposits - $450 million 
Loans - $525 million Bank capital - $100 million 
So the required reserve is $450 * 10/100 = $45 million. 
 
But in the reserve account we have only 25 million so we are falling short of $20 million. We need to maintain this required reserve so we can take following actions: 1. By borrowing $20 millions from other bank or financial institutions or corporations. 2. We can sell securities of $20 million. 3. We can borrow some money and can raise some money by issuing securities.