Depending on condition, around $125.
100-500 USD
It is a semi auto PISTOL, not a revolver. Value depends on exact model and condition. Roughly $100-$350.
Ruger has sn data on their web site. 100-375 USD
Is it a revolver or semi-auto? You can go to Ruger's website to look up the serial number.
10-400 USD or so
100-200
50-500 usd
Ruger is one.
100-200
Ruger 10 /22
61-85