Answer:
Money multiplier= 1 / reserve requirement
a. Reserve requirement = 0.09
Money multiplier = 1 / 0.09
Money multiplier = 11.11
b. Reserve requirement = 0.25
Money multiplier = 1 / 0.25
Money multiplier = 4
c. Reserve requirement = 0.12
Money multiplier = 1 / 0.12
Money multiplier = 8.33
d. Reserve requirement = 0.04
Money multiplier = 1 / 0.04
Money multiplier = 25