-47% is the change from 400 to 212
Calculation steps:
[( 212 - 400 ) ÷ 400] x 100 = -47%
Formula
Percentage change = [(212 - 400) / 400] x 100
Subtract the new number by the original number
212 - 400 = -188
-188 ÷ 400 = -0.47
-0.47 x 100 = -47%
Example