can you explain how to solve each problem and show me the equation you used

Assume initially the re are no excess reserves in the banking system. If the Fed buys 55 billion worth of government securities from banks: T- Account for the Banking System Assets Liabilities Bank Reserves: $25 billion Deposits: $250 billion Loans: $22!: billion Securities: $5 billion Select an answer and submit. For keyboard navigation; use the upfciown arrow keys to select an answer. a bank reserves increaseto $30 billion and excess reserves increase to $5 billion. b bank reserves stay.r $25 billion but excess reserves increase by $5 billion. c bank reserves increase to $30 billion but excess reserves stay,f 50. :1 bank reserves increaseto $30 billion and excess reserves increase to $4.5 billion. The banking system is fullyr loaned up (in equilibrium} if the reserve ratio is: T- Account for the Banking System Assets Liabilities Bank Reserves: $25 billion Deposits: $250 billion Loans: $22 billion Securities: $5 billion Select an answer and submit. For keyboard navigation; use the up,-'I:lown arrow keys to select an answer. a 25%. b 20%. r. 16%