percent is out of 100
so change 5 to 100 by multiplying by 20
then similarly the 2 x 20 = 40
Answer: 40%
2/5 = 20/50 = 40/100
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8%
two fifths is two parts of 5 or 2/5, first express that as part of 100 (as percents work that way) so 2/5 * 20/20 = 40 / 100. Thus two-fifths is 40 percent.
200%
1/2 into percent = 50%
2% is equivalent to 20000ppm