-41.86% is the change from 688 to 400
Calculation steps:
[( 400 - 688 ) ÷ 688] x 100 = -41.86%
Formula
Percentage change = [(400 - 688) / 688] x 100
Subtract the new number by the original number
400 - 688 = -288
-288 ÷ 688 = -0.4186046511627907
-0.4186046511627907 x 100 = -41.86%