Answer:
The correct answer is 8%.
Step-by-step explanation:
The money multiplier shows the degree of change that can be caused in the money supply due to a change in the deposits. It is calculated as 1/RR or required reserve ratio.
If the Federal reserve bank wants the money multiplier to be 12.5,
Money multiplier =

12.5 =

RR =

RR = 0.08
So the required reserve ratio should be 8%.