-64% is the change from 225 to 81
Calculation steps:
[( 81 - 225 ) ÷ 225] x 100 = -64%
Formula
Percentage change = [(81 - 225) / 225] x 100
Subtract the new number by the original number
81 - 225 = -144
-144 ÷ 225 = -0.64
-0.64 x 100 = -64%
Example