-69% is the change from 400 to 124
Calculation steps:
[( 124 - 400 ) ÷ 400] x 100 = -69%
Formula
Percentage change = [(124 - 400) / 400] x 100
Subtract the new number by the original number
124 - 400 = -276
-276 ÷ 400 = -0.69
-0.69 x 100 = -69%
Example