Answer the question on the basis of the following consolidated balance sheet for the commercial banking system. Assume the required reserve ratio is 30 percent. All figures are in billions. Assets:...

Answer the question on the basis of the following consolidated balance sheet for the commercial banking system. Assume the required reserve ratio is 30 percent. All figures are in billions.
Assets:
reserves $51
loans $109
securities $100
property $10
Liabilities + net worth:
checkable deposits $140
stock shares $130


Refer to the data. The maximum amount by which the commercial banking system can expand the supply of money by lending is:
$30 billion.
$23.1 billion.
$27 billion.
$15 billion.