Answer:$90
Explanation:
The reserve ratio is the percentage of deposits that the banks are obligated to keep from customer savings for deposit demand and make the balance available to clients as loans. The federal reserves varies the reserve ratio on it's intention for the money supply, when it intends to increase the money supply it reduce it and vice versa.
In this situation the highest amount that the money supply can be increased with is 90% of the deposit which is $90