Answer:
$25 billion
Explanation:
The difference between a 0.25 reserve ration and a 0.20 reserve ratio is 0.05, which represents $5 billion in available money (= 0.05 x $100 billion).
If the total bank reserves is $100 billion, and the reserve ratio is 0.20, the money multiplier = 1 / 0.20 = 5.
If the banks have $5 billion available for loans and the new money multiplier = 5, then the lending capacity of the banking system will increase by $25 billion (= $5 billion available x money multiplier).