Percentages are Reversable

6% of 50 = 50% of 6 = 3
 

Because x% of y is same as y% of x. This stems from commutative property of multiplication.
 

So, 6/100x50 = 6x50/100

Also X percent of Y is just multiplying the two together and dividing by 100:

  • 7% of 11 = 77/100 = 0.77
  • 4% of 20 = 0.80