In Civil Service Examinations, as well as other examinations in basic mathematics, knowing how to convert percent, fractions, and decimals to each other is very advantageous especially if you can do it mentally. Let us try with the following example.
A P640 shirt is marked 25% discount. How much will you have to pay for it?
It seems that you need a pencil for this problem, but you can actually do it in your head. Read it to believe it.
The equivalent of 25% in fraction is 1/4, therefore, you have to take away the fourth of the price. Now, 1/4 of 640 seems difficult but what if we try to split it to 600 + 40? Now, 1/4 of 600 is 150, which means that from the 600, you have 450 left. Now, 1/4 of 40 is 10, which means that you have 30 left. So, 450 + 30 is 480 and that is the discounted price of the t-shirt. Continue Reading