2/5, 4/10
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40% = 40/100 = 2/5
2 over 5
The word 'percent' means of ' a hundred/ centum ; Latin'. Hence 40% = 40 / 100 = 4/10 = 2/5 (fraction) = 0.4 ( decimal).
2/5 or 40/100 is equal to 40%
2.5% = 0.025 as a decimal. As a fraction, 25/1000 = 1/40