Sometimes, in research articles the difference between two percentage is reported directly. How is it right? Example:
State A has 75% of people of X kind. State B has 80% of people of X kind.
The difference is generally reported as... The difference in these two states (A,B) in terms of people of kind X is only 5 %.
Should we not calculate the percentage difference as follows?
100*(80-75)/80 = 6.25%
Or why not it is
100*(80-75)/75 = 6.66%