Answer:
Keep $1000
Loan $9000
Explanation:
Reserve ratio is the requirement of the central bank that commercial banks must hold unto a certain portion of deposits at all time rather than investing or lending out in order to meet any large and unexpected demand for withdrawal. It is used to control the money supply in the society and influence interest rate.
If the reserve ratio is 10% . This means that 10% of the deposit must be kept as reserve in the bank and the maximum amount available to be given out is 90%
Workings
10% of 10000 = 1000
90% of 10,000 = 9000