A decimal is a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the decimal representation for 21 is 21 and therefore the answer is 21 shillings.
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21/25
1999
That would be the Guinea, it was a gold coin and was equal to 21 shillings in the British pre-decimal system.
All of these denominations beloing to the old redundant British predecimal currency system used by many of the British Empire/Commonwealth countries. 5 Guineas (105 Shillings) - converted to £5.25 in decimal currency. 2 Shillings (1 Forin) - converted to £0.10 in decimal currency. 2 Florins (4 Shillings) - converted to £0.20 in decimal currency. 12 Pence (1 Shilling) - converted to £0.05 in decimal currency.
The UK currency used immediately before decimal currency was called pre-decimal currency and at various times had the following denominations:farthing (quarter penny)half penny (slang ha'penny)pennythreepence (threpenny bit)sixpenceshilling (bob, twelve pennies)two shilling piece (florin, twobob bit)half crown (two shillings and six pence)crown (five shillings)ten shilling note (ten bob)pound note (20 shillings)guinea (21 shillings) still used in the horse trade and racing.five pound notes and multiples thereof to 20 pounds.