It is a
Any change in an amount can be given as a percent (of itself).
For example a change from 8 to 16 could be said as
"The amount doubled" which is the same as saying:
"An increase of 100%"
A change from 8 to 4 could be said as:
"The amount halved" which is the same as saying
"A decrease of 50%"
A change can be an increase, decrease, profit, loss, markup, discount etc. Use the same method:
In this case the change was from
This is an increase of
% change =