A penny.
It is in the decade of the 1960s. (Unlike centuries, which use the next higher hundreds value, the decades normally refer to the tens value of the year.)
$90
You can get 1960s silver half dollars at face value if you build a time machine and travel back to the 1960s. Either that, or silver prices would have to plummet.
$500-$1400.
$500 plus depending on condition
Go to Abebooks.com
50-400 usd
They are still in circulation and only face value.
Depending on condition, 75-150 or so.
Nothing, because there's no such thing. There were no silver dollars minted in the 1960s.
You didn't specify the bill's denomination, but most bills printed in the 1960s and later are only worth face value.
Check that coin again. The U.S. didn't mint any silver dollars in the 1960s.