2900% is the change from 29 to 870
Calculation steps:
[( 870 - 29 ) ÷ 29] x 100 = 2900%
Formula
Percentage change = [(870 - 29) / 29] x 100
Subtract the new number by the original number
870 - 29 = 841
841 ÷ 29 = 29
29 x 100 = 2900%
Example