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Error analysis describe and correct the error in using percent equation

Error analysis describe and correct the error in using percent equation-example-1
User Dabinsi
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the answer is 7
because 10% of 20 is 2.0 so u gotta multiply that by 4 which equals 6 then plus 1 because 1 is 5% of 20
User Kaung Myat Lwin
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