-21.78% is the change from 551 to 431
Calculation steps:
[( 431 - 551 ) ÷ 551] x 100 = -21.78%
Formula
Percentage change = [(431 - 551) / 551] x 100
Subtract the new number by the original number
431 - 551 = -120
-120 ÷ 551 = -0.2177858439201452
-0.2177858439201452 x 100 = -21.78%