-49.75% is the change from 400 to 201
Calculation steps:
[( 201 - 400 ) ÷ 400] x 100 = -49.75%
Formula
Percentage change = [(201 - 400) / 400] x 100
Subtract the new number by the original number
201 - 400 = -199
-199 ÷ 400 = -0.4975
-0.4975 x 100 = -49.75%