b) As a result of the withdrawal, required reserves: decrease by $1,200.
This is because the required reserve ratio is 20%. This means that for every $100 that is withdrawn from the account, the bank must keep $20 in reserves. Since Lucia withdrew $6,000, the bank must keep $1,200 in reserves ($6,000 x 20% = $1,200). Therefore, the required reserves decrease by $1,200.
Required reserves refer to the amount of money that banks must hold in reserve against deposits made by customers. Banks are required to hold a certain percentage of their deposits as reserves with their central bank. These reserves are used to meet customer withdrawals and to cover unexpected losses.
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