-80% is the change from 225 to 45
Calculation steps:
[( 45 - 225 ) ÷ 225] x 100 = -80%
Formula
Percentage change = [(45 - 225) / 225] x 100
Subtract the new number by the original number
45 - 225 = -180
-180 ÷ 225 = -0.8
-0.8 x 100 = -80%
Example