-49.88% is the change from 401 to 201
Calculation steps:
[( 201 - 401 ) ÷ 401] x 100 = -49.88%
Formula
Percentage change = [(201 - 401) / 401] x 100
Subtract the new number by the original number
201 - 401 = -200
-200 ÷ 401 = -0.49875311720698257
-0.49875311720698257 x 100 = -49.88%