If RRR 8 and a 1000 change in reserves yields a 9090 increase in the money supply what percentage of excess reserves do banks hold?

To calculate the percentage of excess reserves banks hold, we first need to determine the required reserves using the required reserve ratio (RRR) of 8%. If a $1,000 change in reserves leads to a $9,090 increase in the money supply, we can infer the total reserves needed to support that increase. The money multiplier is 9.09 (calculated as $9,090 increase in money supply divided by $1,000 change in reserves). Given the RRR of 8%, the required reserves would be $80 (8% of $1,000), and the excess reserves would be $920 ($1,000 total reserves - $80 required). Thus, the percentage of excess reserves is approximately 92%.