Answer:
(a) Excess reserves = 200
(b) Monetary base (B) = 900
(c) Money multiplier = 10
Step-by-step explanation:
Assuming that the required reserve ratio (missing in the question) is 0.1:
(a) Excess reserves = Reserves - Required reserves
Reserves = 400
Required reserves = Deposits x Required reserve ratio
= 2000 x 0.1
= 200
Hence, Excess reserves = 400 - 200
= 200
(b) Monetary base (B) = Reserves + Currency
= 400 + 500
= 900
(c) Money multiplier = 1 / Required reserve ratio
= 1 / 0.1
= 10