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Joslyn Small
Mathematics
23 July, 23:07
1. what is 10+20%?
2. what is 10-20%?
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Maritza Johnston
23 July, 23:10
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The question can be misunderstood
10 + 20% = 10 + 20/100 = 10 + 0.2 = 10.2
But if the question is what is 10 increased by 20% it is
10 * (1 + 20%) = 10 * (1 + 0.2) = 10 * 1.2 = 12
So that is different.
Else with the other question
10 - 20% = 10 - 20/100 = 10 - 0.2 = 9.8
10 * (1 - 20%) = 10 * (1 - 0.2) = 10 * 0.8 = 8
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Kinley Gordon
23 July, 23:31
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10 - 20% = 10 - 20/100 = 10 - 0.2 = 9.8
10 * (1 - 20%) = 10 * (1 - 0.2) = 10 * 0.8 = 8
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