-57% is the change from 400 to 172
Calculation steps:
[( 172 - 400 ) ÷ 400] x 100 = -57%
Formula
Percentage change = [(172 - 400) / 400] x 100
Subtract the new number by the original number
172 - 400 = -228
-228 ÷ 400 = -0.57
-0.57 x 100 = -57%
Example