A guinea was 21 shillings = 1 pound 1 shilling
So 10 guineas was 10 x 21 shillings = 10 pounds 10 shillings
A shilling was 12d and 1 pound was 240d ⇒ 1 shilling was 12/240 = 1/20 pound
At decimalization in 1971, £1 = 100p = 240d ⇒ 1 shilling = 1/20 x 100p = 5p
⇒ 10 pounds 10 shillings = £10 + 10 x 5p
= £10.50 in decimal currency.
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64.96 - 10% = 64.96 x (1 - (10/100)) = 58.464. If the number refers to a unit of currency, don't forget to round to the appropriate number of decimal places and include the appropriate currency unit.
Currency is a form of money. The British Pound, US Dollar, Australian Dollar, Canadian Dollar, Euro, etc are all different types of currency. Coins ,usually made of metal, is money a government produces as part of their currency. Pennies, nickels, dimes, quarters, 10 pence, 20 pence, 50 pence, 10 cents, 50 cents, etc. are all different types of coins.
100 cent (10X10) therefor one dollar (U.S currency)
Pound currency = 10 pence Pound mass = 1.6 ounces
the power of 10 mean 10 100 1,000 100,000 the power of 10 mean 10 100 1,000 100,000