770% is the change from 100 to 870
Calculation steps:
[( 870 - 100 ) ÷ 100] x 100 = 770%
Formula
Percentage change = [(870 - 100) / 100] x 100
Subtract the new number by the original number
870 - 100 = 770
770 ÷ 100 = 7.7
7.7 x 100 = 770%
Example