-47.75% is the change from 400 to 209
Calculation steps:
[( 209 - 400 ) ÷ 400] x 100 = -47.75%
Formula
Percentage change = [(209 - 400) / 400] x 100
Subtract the new number by the original number
209 - 400 = -191
-191 ÷ 400 = -0.4775
-0.4775 x 100 = -47.75%