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45 % is same as 50% - 5%

So halve the number for 50% then divide that by 10 to get 5%

Example: 45% of 96 is calculated as

[50%] 96 / 2 = 48

[5%] 48 / 10 = 4.8

Then 48 - 4.8 = 43.2

Check : 96 x 0.45 = 43.2 on calculator. QED

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12y ago

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