-27.4% is the change from 551 to 400
Calculation steps:
[( 400 - 551 ) ÷ 551] x 100 = -27.4%
Formula
Percentage change = [(400 - 551) / 551] x 100
Subtract the new number by the original number
400 - 551 = -151
-151 ÷ 551 = -0.27404718693284935
-0.27404718693284935 x 100 = -27.4%