What is 2 fifths as a percentage?

The answer is 40%, because one fifth as a percentage is 20%, and if you double 20%, it makes 40%, so to confirm, 2 fifths as a percentage = 40%.

Good luck with the rest of your maths!
2 fifths = 2 * 1/5 = 2/5

∴ 2/5 in percentage = 2/5 * 100 = 40%