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About $5 retail.
The value depends on the series (date) and condition. If it's series 1976 or later, it's worth face value.
1848. Silver. Twenty. Dollar. Coin
In worn condition, face value only. If nearly new, $8.
Twenty Australian dollars
Not enough information. What date? What condition? Please post a new question.
In circulated condition, it has little or no added value. A nice crisp uncirculated one is worth about $50.00
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$20 Dollars.
nothing
Face value only. Also, as you've seen from other postings, a bill's serial number is almost never a factor in its value. Date, series letter, seal color, and condition are what matter in most cases.
At least $40. In almost-new condition its value can be over $100.
$5 to $10 in average circulated condition
The value is determined by the series (date) and condition.
If you have four of them, then the set is worth $80.
About $5 retail.
depending on the condition, ≈$5~10