Number is decreased by %.  
Fill in two values.
% of =  
Example: 15% of 200 = 30
Fill in two values.
Original price of product:
Price has been %
Final sales price is
Example: Original price 60, 20% discount = Sales price 48.

You can also calculate by using examples below

How much is % of ?  
How many % is of
First number is . Second number is .
What is the change (increase or decrease) from first number to second number?
= How many percentages bigger or smaller is the second number?
Number is increased by %.