The answer will depend on which country's coinage the question is about.
That would depend on the country of the coinage.
All circulating bicentennial coinage is worth face value.
The decimal system refers to counting in tens and powers of tens and this system was used when Australia was colonised by Britain in 1788. Decimal coinage was introduced much later - in 1966.
as a decimal 0.2 as a percentage 20%
Check that coin again. Canada didn't get its own coinage until 1858.
....No such coin exists. The US didn't even exist as a country in 1758, nor was nickel used in coinage much back in 1758.
Under pre-decimal currency in the UK, a shilling was worth twelve pence, and a sixpence worth six pence. The UK adopted decimal currency in 1971.
It would be worth 12.5 pence.
1915 was the last year for Barber coinage. 1916 is first year issue for Standing Liberty quarters if you have a 1916 SLQ I suggest you take it to a dealer or collector for an assessment they can be very valuable.
The Philadelphia Mint hasn't produced silver coinage for circulation since 1964. A 2003-P state quarter is worth 25 cents.
None of the Bicentennial coinage made for general circulation contain any silver or is worth more than face value. Only Proof and collectors coins sold from the US Mint are worth more.
What first edition cards are worth can depend on their condition. What type of cards they are, and how much you paid for them can also determine how much they are worth.