How to work out percentage increase and decrease

• rate of change : [100% * (final / initial)] - 100%
  (note: if change is + : increase; if change is - : decrease)
  [100% * (15.8/14.1)] - 100%
  = (100% * 1.12) - 100%
  = 112% - 100%
  = 12% increase

The way to work it out

• First of all ,there are two quantities.We term one as "initial quantity " and the second one as the final quantity".If the final quantity is more than the initial quantity,we say that there is an increase…