The maximum possible change in the money supply is $250 million.
The change in required reserves when an amount of money is deposited in a bank is determined by the reserve requirement.
Reserve requirement = increase in required reserves / amount deposited
$10 million / $50 million = 0.20 = 20%
The change in money supply can be determined using this formula:
Amount deposited / reserve requirement
$50 million / 20%
$50 million / 0.2 = $250 million
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