Premium for Circulated Silver Dollars

When dealers buy junk silver I know that a silver dollar will be worth more than 2 halves, 4 quarters or ten dimes. How much more will a dealer usually pay for the silver dollar over $1.00 in face value for silver coins? Thanks.
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Comments
decent.....$15 to $18
more if UNC
www.brunkauctions.com
DPOTD-3
'Emancipate yourselves from mental slavery'
CU #3245 B.N.A. #428
Don
If $1 junk 90% bid is 10x face then,
1921 Morgan/Peace 12x,
pre-1921 Morgan 13x.
As always YMMV.
Hard case dealer. Cheers, RickO