1085.71% is the change from 70 to 830
Calculation steps:
[( 830 - 70 ) ÷ 70] x 100 = 1085.71%
Formula
Percentage change = [(830 - 70) / 70] x 100
Subtract the new number by the original number
830 - 70 = 760
760 ÷ 70 = 10.857142857142858
10.857142857142858 x 100 = 1085.71%