Answer:
c. fall from 20 to 10.
Step-by-step explanation:
The formula for the money multiplier is 1/reserve ratio,this means that the lower the reserve ratio the higher the multiplier, the reason for this is when the reserve ratio is lower banks can loan out a higher proportion of money therefore more money is created thus the multiplier and reserve ratio have an inverse relationship.
when the reserve ratio is 5% the multiplier is 1/0.05=20
When the reserve ratio is changed to 10% the multiplier is 1/0.1= 10
So the multiplier changes from 20 to 10.