You can put this solution on YOUR website! Express the fraction 2/5 as a decimal by dividing 5 into 2.00 (you get .40), and then convert the decimal to a percent, by moving the decimal two places to the right. This means that .40 = 40%.
Another way to do this particular problem is to start with the fraction 2/5 and multiply the numerator and denominator by 2. This gives the very special fraction 4/10, which as a decimal would be .4 or .40. Then convert to a percent as above .40 = 40%.