Australian 20 cent coins were issued from 1966 until present day. They are still in circulation, so unless they are part of a proof set or there is something rare and unique about them, they are worth 20 cents.
The Australian 20 cent coin was first issued in 1966 and has maintained the same platypus design on the reverse, except for those years when the 20 cent coin is used as a commemorative.
See the link below to the Royal Australian Mint for mintage and design details of the Australian 20 cent coin.
The Royal Australian Mint struck ten million of the Sir Donald Bradman 20 cent coins that commemorated the passing of Australia's greatest cricketing hero.
This coin comes in four variants. An Australian 1996 Five Dollar (Sir Donald Bradman tribute) coin in absolute mint condition could fetch up to $20 AUD. There were 237,728 minted. An Australian 1996 Five Dollar (Sir Donald Bradman tribute)(Westpac) coin in absolute mint condition could fetch up to $25 AUD. There were 310,213 minted. An Australian 1996 Five Dollar (Sir Donald Bradman tribute)(Proof) coin in absolute mint condition could fetch up to $295 AUD. There were 22,523 minted. An Australian 1997 Five Dollar (Sir Donald Bradman tribute)(Coin/stamp cover) coin in absolute mint condition could fetch up to $35 AUD. There were 275,000 minted. A reputable coin dealer will be able to give a more accurate valuation.
There were 4,337,200 Australian 1997 50 cent coins minted.
Such a coin does not exist. The Australian "cent" coins were first introduced in 1966.
Australian 1 cent coins are no longer in circulation, but unless they are part of a proof set or are in mint condition, they are worth 1 cent.
The Australian 2 cent coin was introduced at the changeover to decimal currency in 1966. There were no Australian "cent" coins minted prior to 1966.
An Australian Twenty cent coin weighs 11.31 grams, so there would be about 88 Twenty cent coins in a Kilogram.
There are 100 cents in the Australian Dollar. That can constitute - 20 x 5 cent coins. 10 x 10 cent coins. 5 x 20 cent coins. 2 x 50 cent coins. 1 x 1 Dollar coin. The 1 and 2 cent coins are no longer in circulation.
The Royal Australian Mint produced 19.031 million standard cupro-nickel 50 cent coins.
Presumably, you refer to the Australian 50 cent coin. The round Australian 50 cent coin was only ever minted for 1966. All subsequent Australian 50 cent coins are dodecagonal or 12 sided.
An Australian 2001 50 cent coin roll, in the original Mint wrapper, uncirculated and in absolute mint condition could fetch up to $70 AUD. Coin rolls for all nine coins issued for this theme have the same value. A reputable coin dealer will be able to give a more accurate valuation.
An Australian 5 cent coin weighs 2.83 grams. Figure it out.
Such a coin does not exist. The first Australian 20 cent coins were issued in 1966.