Answer:
A. Excess reserves will decrease by $20,000
Step-by-step explanation:
If demand deposits is $200,000, then $20,000 ($200,000 x 0.1) must be held as required reserves.
Mathematically;
RR= DD×r
RR= required reserve (?)
DD= demand deposits ($200,000)
r= reserve rating (0.10)
RR=$200,000×0.10
RR=$20,000
So if reserve ratio is increased to 20%
RR= required reserve (?)
DD= demand deposits ($200,000)
r= reserve rating (0.20)
RR=$200,000×0.20
RR=$40,000
Meanwhile, our excess reserve is $40,000
So if we increase the reserve ratio by 20% our required reserve will increase to $40,000 which will reduce our excess reserve from $40,000 to $20,000.