Refer to the accompanying consolidated balance sheet for the commercial banking system. Assume the required reserve ratio is 10 percent. All figures are in billions.

Assets Liabilities + Net Worth
Reserves $120,000 Checkable Deposits $300,000
Loans 140,000 Stock Shares 200,000
Securities 40,000
Property 200,000

After the deposit of $10 billion of new currency, the maximum amount by which this commercial banking system can expand the supply of money by lending is:

a. $120,000 billion.
b. $300,000 billion.
c. $600,000 billion.
d. $900,000 billion.