Assume that the public in the small country of Sylvania does not hold any cash. Commercial banks, however, hold 10 percent of their checking deposits as excess reserves, regardless of the interest rate. In the questions that follow, the "money multiplier" is given by 1 / (RR + ER ). Where

RR = the percentage of deposits that banks are required to keep as reserves
ER = the percentage of deposits that banks voluntarily hold as excess reserves

Consider the balance sheet of one of several identical banks:

Assets Liabilities and Net Worth
Reserves 400 Checking Deposits 2,000
Loans 1,600 Net Worth 0
Total Assets 2,000 Liabilities and Net Worth 2,000

The required reserve ratio in this economy is %. (Enter your response as an integer.)
If the total money stock (supply) is $600,000, the total amount of reserves held in the banking system is $