2810% is the change from 30 to 873
Calculation steps:
[( 873 - 30 ) ÷ 30] x 100 = 2810%
Formula
Percentage change = [(873 - 30) / 30] x 100
Subtract the new number by the original number
873 - 30 = 843
843 ÷ 30 = 28.1
28.1 x 100 = 2810%
Example