Answer: Required reserve=$2m
Excess reserve=$3m
Maximum by which deposit can expand is extra $30m or total of $50m
Explanation:
Reserve is the amount of money stipulated to be kept in central or reserve Bank by commercial banks ,as sort of guarantee deposit,this reserve can be used for monetary policies like controlling the amount of money in circulation
Reserve amount=10%of 20m=2m
Excess =actual reserve-stipulated reserve=5-2=$3m
Maximum demand deposit =5×10=$50m