12% of 50 pence
= 12% * 50 pence
= 0.12 * 50 pence
= 6 pence
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50/100 x 84 =42
2 pounds 58 pence
6 out of 12 = 50%
If you have 50 pence left after spending 90% of your money, it means you spent 90 pence (since 90% of a pound is 90 pence). To find out how much money you started with, you need to calculate what 10% of the total amount would be. Since 10% is half of 20%, you can double the amount you have left, 50 pence, to get 100 pence. Therefore, you started with 1 pound.
First of all you need to work out the cost of One gram 40/12=3.33333333 pence Then multiply the cost of One gram by 600 to get the cost of Six hundred grams 3.33333333*600 = 2000 pence or £20.00 -------------------------------------------- Alternatively 600/12 = 50 and 50 times 48 pence = 2000 pence or £20.00