880% is the change from 70 to 686
Calculation steps:
[( 686 - 70 ) ÷ 70] x 100 = 880%
Formula
Percentage change = [(686 - 70) / 70] x 100
Subtract the new number by the original number
686 - 70 = 616
616 ÷ 70 = 8.8
8.8 x 100 = 880%
Example