Question 2537
Percentage means per 100
so 5% means = 5/100
so 5% 0f 80 will be (5/100)*80= 400/100 = 4

SImilarly u can find out
for example 15% of 60
so 15% of 60 = (15/100) of 60 = (15/100) * 60 = 900/100 = 9

Hope this helps....

Now let me explain the other way round

How much percentage of 60 is 9?

Let 9 be x% of 60
=> (x/100)*60 = 9
=> 60x = 900
=> x = 900/60 = 15

So if a person gets 9 marks out of 60....in percentage it will be (9/60)*100.