c) Assume Central Bank of an economy has put the required reserve ratio (r) as 10%. Assume that the banking system has excess reserves equal to 4 billion. Further, the currency in circulation equals $ 450 billion, and the total amount of checkable deposits equals $ 900 billion. Based on these numbers. Calculate: i) Required reserves held by the banking system (2 marks) ii) Total rescrves held by tle banking system (2 marks) %ii) Monetary base . ' (2 marks)Total money supply (M) g (2 marks) iv) The money mufltiplier (2 marks)