·      To Work out a % of a quantity:

 

e.g., 85% of 360

360 X 85 % =

 

·      To Work out a % increase:

 

e.g., increase 450 by 2%

 

450 X (  1  + 2 % )  =

 

·      To Work out a % decrease:

 

e.g., decrease 750 by 15%

750 X (  1  -  15 % )  =