40%
Theory:
2/5 equals 4/10.
10x10=100, so 4x10=40, so 40%.
A percentage simply means out of 100, so it would mean 40 out of 100.
Percent means "for every 100" or, in other words, "out of 100", so when converting a fraction to a percentage, you are making it an equivalent fraction out of 100. The easiest way to do this is to multiply by 100:
2/5 = 2/5 x 100 % = 40 %
As equivalent fractions, this becomes:
since 100 ÷ 5 = 20, multiply the numerator and denominator by 20:
2/5 = 2x20/5x20 = 40/100 = 40 %
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