4. The Friendly National Bank holds $50 million in reserves at its Federal Reserve District Bank. The required reserves ratio is 12 percent. a. If the bank has $600 million in deposits, what amount of vault cash would be needed for the bank to be in compliance with the required reserves ratio? b. If the bank holds $10 million in vault cash, determine the required reserves ratio that would be needed for the bank to avoid a reserves deficit. c. If the Friendly National Bank experiences a required reserves deficit, what actions can it take to be in compliance with the existing required reserves ratio