The table below is the balance sheet for all banks combined in the banking system. All banks have a target reserve ratio of $4\%.$

a$.$ The amount of excess reserves is $

b$.$ The maximum amount that loans and deposits could be increased by is $

c$.$ Assume that the system becomes fully loaned up$.$ Show the new balance sheet in the table above.

d$.$ Now that the system is fully loaned up$,$ the money supply will have increased by $