What is the ratio of a deposit that the fed requires banks to keep in reserve?
a. the stored ratio
b. the required reserve ratio
c. the compulsory ratio
d. the mandatory ratio

Reserve ratio is the ratio of a bank's reserves to the amount of its demand deposits, i.e. its checking deposits. The Fed sets the required minimum ratio, currently 10%. Even with no specified minimum ratio, banks would have to maintain sufficient reserves to cover checks written by depositors and to provide cash on demand.