-33.61% is the change from 830 to 551
Calculation steps:
[( 551 - 830 ) ÷ 830] x 100 = -33.61%
Formula
Percentage change = [(551 - 830) / 830] x 100
Subtract the new number by the original number
551 - 830 = -279
-279 ÷ 830 = -0.336144578313253
-0.336144578313253 x 100 = -33.61%